; LLVM IR from hadryansalles/Luz :: deps/imgui/imgui.ll (ZN5ImGui16CallContextHooksEP12ImGuiContext20ImGuiContextHookType)

; Unoptimized IR (clang -disable-llvm-passes):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%struct.ImGuiContext = type { i8, i8, %struct.ImGuiIO, %struct.ImGuiPlatformIO, %struct.ImGuiStyle, i32, i32, ptr, float, float, %struct.ImDrawListSharedData, double, i32, i32, i32, i32, i8, i8, i8, i8, i8, ptr, %struct.ImVector.3, %struct.ImVector.3, i32, i32, %struct.ImVector.4, %struct.ImVector.4, %struct.ImVector.4, %struct.ImVector.5, %struct.ImGuiStorage, i32, %struct.ImVec2, i32, ptr, ptr, ptr, ptr, ptr, %struct.ImVec2, i32, i32, float, %struct.ImVec2, %struct.ImVec2, i32, i32, i32, i8, i8, float, float, i32, i32, float, i8, i8, i8, i8, i8, i8, i8, i8, %struct.ImVec2, ptr, i32, i32, i8, i8, ptr, i32, float, double, double, double, %struct.ImBitArray, [154 x %struct.ImGuiKeyOwnerData], %struct.ImGuiKeyRoutingTable, i32, i8, i32, i32, i32, i32, i32, [4 x i8], %struct.ImGuiNextItemData, %struct.ImGuiLastItemData, [4 x i8], %struct.ImGuiNextWindowData, i8, i32, %struct.ImVector.8, %struct.ImVector.9, %struct.ImVector.10, %struct.ImVector.11, %struct.ImVector.12, %struct.ImVector.13, %struct.ImVector.14, %struct.ImVector.14, %struct.ImVector.15, i32, %struct.ImVector.16, float, ptr, ptr, ptr, i32, %struct.ImGuiPlatformMonitor, i32, i32, i32, ptr, i32, i32, %struct.ImVector.11, i32, i32, i32, i32, i32, float, i32, i32, i32, i32, i32, i32, i32, i64, i8, i8, i8, i8, i8, i8, i8, i8, %struct.ImGuiNavItemData, i8, i8, i8, i32, i32, i32, i32, i32, i32, %struct.ImRect, %struct.ImRect, i32, i32, i32, %struct.ImGuiNavItemData, %struct.ImGuiNavItemData, %struct.ImGuiNavItemData, %struct.ImGuiNavItemData, i32, i32, ptr, ptr, ptr, float, float, i8, %struct.ImVec2, %struct.ImVec2, float, i8, i8, i8, i32, i32, i32, %struct.ImGuiPayload, %struct.ImRect, %struct.ImRect, i32, i32, float, i32, i32, i32, i32, %struct.ImVector.17, [16 x i8], i32, %struct.ImVector.18, ptr, i32, i32, %struct.ImVector.19, %struct.ImPool, %struct.ImVector.21, %struct.ImVector.22, ptr, %struct.ImPool.23, %struct.ImVector.25, %struct.ImVector.26, i32, i32, float, float, i32, i32, i32, float, %struct.ImVec2, %struct.ImGuiInputTextState, %struct.ImGuiInputTextDeactivatedState, %struct.ImFont, i32, i32, i32, i32, float, float, i32, %struct.ImVec4, %struct.ImGuiComboPreviewData, %struct.ImRect, i8, float, float, i8, i8, float, float, float, float, i16, i16, i16, %struct.ImVector.27, %struct.ImVector.29, %struct.ImGuiTypingSelectState, %struct.ImGuiPlatformImeData, %struct.ImGuiPlatformImeData, i32, [4 x i8], %struct.ImGuiDockContext, ptr, i8, float, %struct.ImGuiTextBuffer, %struct.ImVector.32, %struct.ImChunkStream, %struct.ImChunkStream.33, %struct.ImVector.34, i32, [11 x ptr], i8, i32, ptr, %struct.ImGuiTextBuffer, ptr, ptr, float, i8, i32, i32, i32, i32, %struct.ImGuiTextBuffer, %struct.ImGuiTextIndex, i32, i8, i8, i8, i32, i8, i8, i8, i32, float, %struct.ImVec4, %struct.ImGuiMetricsConfig, %struct.ImGuiIDStackTool, %struct.ImGuiDebugAllocInfo, ptr, [60 x float], i32, i32, float, i32, i32, i32, %struct.ImVector.27, [64 x i8] }
%struct.ImGuiIO = type { i32, i32, %struct.ImVec2, float, float, ptr, ptr, ptr, ptr, float, i8, ptr, %struct.ImVec2, i8, i8, i8, i8, i8, i8, i8, i8, i8, i8, i8, i8, i8, i8, i8, i8, float, float, float, float, float, float, i8, i8, i8, i8, i8, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, i16, i8, i8, i8, i8, i8, i8, i8, float, i32, i32, i32, i32, %struct.ImVec2, [666 x i32], [666 x i8], [16 x float], ptr, %struct.ImVec2, [5 x i8], float, float, i32, i32, i8, i8, i8, i8, i32, [666 x %struct.ImGuiKeyData], i8, %struct.ImVec2, [5 x %struct.ImVec2], [5 x double], [5 x i8], [5 x i8], [5 x i16], [5 x i16], [5 x i8], [5 x i8], [5 x i8], i8, [5 x float], [5 x float], [5 x %struct.ImVec2], [5 x float], float, i8, i8, i8, i8, i16, %struct.ImVector }
%struct.ImGuiKeyData = type { i8, float, float, float }
%struct.ImVector = type { i32, i32, ptr }
%struct.ImGuiPlatformIO = type { ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, %struct.ImVector.0, %struct.ImVector.1 }
%struct.ImVector.0 = type { i32, i32, ptr }
%struct.ImVector.1 = type { i32, i32, ptr }
%struct.ImGuiStyle = type { float, float, %struct.ImVec2, float, float, %struct.ImVec2, %struct.ImVec2, i32, float, float, float, float, %struct.ImVec2, float, float, %struct.ImVec2, %struct.ImVec2, %struct.ImVec2, %struct.ImVec2, float, float, float, float, float, float, float, float, float, float, float, float, i32, %struct.ImVec2, %struct.ImVec2, float, %struct.ImVec2, %struct.ImVec2, %struct.ImVec2, %struct.ImVec2, float, float, i8, i8, i8, float, float, [55 x %struct.ImVec4], float, float, float, i32, i32 }
%struct.ImDrawListSharedData = type { %struct.ImVec2, ptr, float, float, float, %struct.ImVec4, i32, %struct.ImVector.2, [48 x %struct.ImVec2], float, [64 x i8], ptr }
%struct.ImVector.2 = type { i32, i32, ptr }
%struct.ImVector.3 = type { i32, i32, ptr }
%struct.ImVector.4 = type { i32, i32, ptr }
%struct.ImVector.5 = type { i32, i32, ptr }
%struct.ImGuiStorage = type { %struct.ImVector.6 }
%struct.ImVector.6 = type { i32, i32, ptr }
%struct.ImBitArray = type { [5 x i32] }
%struct.ImGuiKeyOwnerData = type <{ i32, i32, i8, i8, [2 x i8] }>
%struct.ImGuiKeyRoutingTable = type { [154 x i16], %struct.ImVector.7, %struct.ImVector.7 }
%struct.ImVector.7 = type { i32, i32, ptr }
%struct.ImGuiNextItemData = type <{ i32, i32, i64, float, i32, i8, i8, [6 x i8] }>
%struct.ImGuiLastItemData = type { i32, i32, i32, %struct.ImRect, %struct.ImRect, %struct.ImRect, %struct.ImRect }
%struct.ImGuiNextWindowData = type <{ i32, i32, i32, i32, i32, %struct.ImVec2, %struct.ImVec2, %struct.ImVec2, %struct.ImVec2, %struct.ImVec2, i32, i8, i8, [2 x i8], %struct.ImRect, [4 x i8], ptr, ptr, float, i32, i32, %struct.ImGuiWindowClass, %struct.ImVec2, [4 x i8] }>
%struct.ImGuiWindowClass = type <{ i32, i32, i32, i32, i32, i32, i32, i8, i8, [2 x i8] }>
%struct.ImVector.8 = type { i32, i32, ptr }
%struct.ImVector.9 = type { i32, i32, ptr }
%struct.ImVector.10 = type { i32, i32, ptr }
%struct.ImVector.12 = type { i32, i32, ptr }
%struct.ImVector.13 = type { i32, i32, ptr }
%struct.ImVector.14 = type { i32, i32, ptr }
%struct.ImVector.15 = type { i32, i32, ptr }
%struct.ImVector.16 = type { i32, i32, ptr }
%struct.ImGuiPlatformMonitor = type { %struct.ImVec2, %struct.ImVec2, %struct.ImVec2, %struct.ImVec2, float, ptr }
%struct.ImVector.11 = type { i32, i32, ptr }
%struct.ImGuiNavItemData = type <{ ptr, i32, i32, %struct.ImRect, i32, [4 x i8], i64, float, float, float, [4 x i8] }>
%struct.ImGuiPayload = type <{ ptr, i32, i32, i32, i32, [33 x i8], i8, i8, [5 x i8] }>
%struct.ImVector.17 = type { i32, i32, ptr }
%struct.ImVector.18 = type { i32, i32, ptr }
%struct.ImVector.19 = type { i32, i32, ptr }
%struct.ImPool = type { %struct.ImVector.20, %struct.ImGuiStorage, i32, i32 }
%struct.ImVector.20 = type { i32, i32, ptr }
%struct.ImVector.21 = type { i32, i32, ptr }
%struct.ImVector.22 = type { i32, i32, ptr }
%struct.ImPool.23 = type { %struct.ImVector.24, %struct.ImGuiStorage, i32, i32 }
%struct.ImVector.24 = type { i32, i32, ptr }
%struct.ImVector.25 = type { i32, i32, ptr }
%struct.ImVector.26 = type { i32, i32, ptr }
%struct.ImVec2 = type { float, float }
%struct.ImGuiInputTextState = type <{ ptr, i32, i32, i32, [4 x i8], %struct.ImVector, %struct.ImVector.27, %struct.ImVector.27, i8, [3 x i8], i32, float, %"struct.ImStb::STB_TexteditState", float, i8, i8, i8, i8, i32, [4 x i8] }>
%"struct.ImStb::STB_TexteditState" = type { i32, i32, i32, i8, i32, i8, i8, i8, i8, i8, i8, i8, float, %"struct.ImStb::StbUndoState" }
%"struct.ImStb::StbUndoState" = type { [99 x %"struct.ImStb::StbUndoRecord"], [999 x i16], i16, i16, i32, i32 }
%"struct.ImStb::StbUndoRecord" = type { i32, i32, i32, i32 }
%struct.ImGuiInputTextDeactivatedState = type { i32, %struct.ImVector.27 }
%struct.ImFont = type <{ %struct.ImVector.21, float, float, %struct.ImVector, %struct.ImVector.28, ptr, ptr, ptr, i16, i16, i16, i16, float, float, i8, [3 x i8], float, float, float, i32, [2 x i8], [2 x i8] }>
%struct.ImVector.28 = type { i32, i32, ptr }
%struct.ImGuiComboPreviewData = type { %struct.ImRect, %struct.ImVec2, %struct.ImVec2, %struct.ImVec2, float, i32 }
%struct.ImRect = type { %struct.ImVec2, %struct.ImVec2 }
%struct.ImVector.29 = type { i32, i32, ptr }
%struct.ImGuiTypingSelectState = type <{ %struct.ImGuiTypingSelectRequest, [64 x i8], i32, i32, float, i8, [3 x i8] }>
%struct.ImGuiTypingSelectRequest = type { i32, i32, ptr, i8, i8, i8 }
%struct.ImGuiPlatformImeData = type { i8, %struct.ImVec2, float }
%struct.ImGuiDockContext = type <{ %struct.ImGuiStorage, %struct.ImVector.30, %struct.ImVector.31, i8, [7 x i8] }>
%struct.ImVector.30 = type { i32, i32, ptr }
%struct.ImVector.31 = type { i32, i32, ptr }
%struct.ImVector.32 = type { i32, i32, ptr }
%struct.ImChunkStream = type { %struct.ImVector.27 }
%struct.ImChunkStream.33 = type { %struct.ImVector.27 }
%struct.ImVector.34 = type { i32, i32, ptr }
%struct.ImGuiTextBuffer = type { %struct.ImVector.27 }
%struct.ImGuiTextIndex = type <{ %struct.ImVector.12, i32, [4 x i8] }>
%struct.ImVec4 = type { float, float, float, float }
%struct.ImGuiMetricsConfig = type { i8, i8, i8, i8, i8, i8, i8, i8, i8, i8, i32, i32 }
%struct.ImGuiIDStackTool = type { i32, i32, i32, %struct.ImVector.35, i8, float }
%struct.ImVector.35 = type { i32, i32, ptr }
%struct.ImGuiDebugAllocInfo = type { i32, i32, i16, [6 x %struct.ImGuiDebugAllocEntry] }
%struct.ImGuiDebugAllocEntry = type { i32, i16, i16 }
%struct.ImVector.27 = type { i32, i32, ptr }
%struct.ImGuiContextHook = type { i32, i32, i32, ptr, ptr }

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN5ImGui16CallContextHooksEP12ImGuiContext20ImGuiContextHookType(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %10, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.ImGuiContext, ptr %11, i32 0, i32 248
  store ptr %12, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %13 = load ptr, ptr %6, align 8, !tbaa !5
  %14 = call noundef ptr @_ZN8ImVectorI16ImGuiContextHookE5beginEv(ptr noundef nonnull align 8 dereferenceable(16) %13)
  store ptr %14, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  %15 = load ptr, ptr %6, align 8, !tbaa !5
  %16 = call noundef ptr @_ZN8ImVectorI16ImGuiContextHookE3endEv(ptr noundef nonnull align 8 dereferenceable(16) %15)
  store ptr %16, ptr %8, align 8, !tbaa !5
  br label %17

17:                                               ; preds = %36, %2
  %18 = load ptr, ptr %7, align 8, !tbaa !5
  %19 = load ptr, ptr %8, align 8, !tbaa !5
  %20 = icmp ne ptr %18, %19
  br i1 %20, label %22, label %21

21:                                               ; preds = %17
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  br label %39

22:                                               ; preds = %17
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #3
  %23 = load ptr, ptr %7, align 8, !tbaa !5
  store ptr %23, ptr %9, align 8, !tbaa !5
  %24 = load ptr, ptr %9, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.ImGuiContextHook, ptr %24, i32 0, i32 1
  %26 = load i32, ptr %25, align 4, !tbaa !11
  %27 = load i32, ptr %4, align 4, !tbaa !9
  %28 = icmp eq i32 %26, %27
  br i1 %28, label %29, label %35

29:                                               ; preds = %22
  %30 = load ptr, ptr %9, align 8, !tbaa !5
  %31 = getelementptr inbounds %struct.ImGuiContextHook, ptr %30, i32 0, i32 3
  %32 = load ptr, ptr %31, align 8, !tbaa !14
  %33 = load ptr, ptr %5, align 8, !tbaa !5
  %34 = load ptr, ptr %9, align 8, !tbaa !5
  call void %32(ptr noundef %33, ptr noundef %34)
  br label %35

35:                                               ; preds = %29, %22
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #3
  br label %36

36:                                               ; preds = %35
  %37 = load ptr, ptr %7, align 8, !tbaa !5
  %38 = getelementptr inbounds %struct.ImGuiContextHook, ptr %37, i32 1
  store ptr %38, ptr %7, align 8, !tbaa !5
  br label %17

39:                                               ; preds = %21
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  ret void
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef ptr @_ZN8ImVectorI16ImGuiContextHookE5beginEv(ptr noundef nonnull align 8 dereferenceable(16)) #2 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef ptr @_ZN8ImVectorI16ImGuiContextHookE3endEv(ptr noundef nonnull align 8 dereferenceable(16)) #2 align 2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #2 = { inlinehint mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #3 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"_ZTS20ImGuiContextHookType", !7, i64 0}
!11 = !{!12, !10, i64 4}
!12 = !{!"_ZTS16ImGuiContextHook", !13, i64 0, !10, i64 4, !13, i64 8, !6, i64 16, !6, i64 24}
!13 = !{!"int", !7, i64 0}
!14 = !{!12, !6, i64 16}


; Optimized IR (opt -passes='default<O3>'):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN5ImGui16CallContextHooksEP12ImGuiContext20ImGuiContextHookType(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = getelementptr inbounds i8, ptr %0, i64 25016
  %4 = tail call noundef ptr @_ZN8ImVectorI16ImGuiContextHookE5beginEv(ptr noundef nonnull align 8 dereferenceable(16) %3)
  %5 = tail call noundef ptr @_ZN8ImVectorI16ImGuiContextHookE3endEv(ptr noundef nonnull align 8 dereferenceable(16) %3)
  %.not12 = icmp eq ptr %4, %5
  br i1 %.not12, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %12, %2
  ret void

.lr.ph:                                           ; preds = %2, %12
  %.013 = phi ptr [ %13, %12 ], [ %4, %2 ]
  %6 = getelementptr inbounds i8, ptr %.013, i64 4
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %8 = icmp eq i32 %7, %1
  br i1 %8, label %9, label %12

9:                                                ; preds = %.lr.ph
  %10 = getelementptr inbounds i8, ptr %.013, i64 16
  %11 = load ptr, ptr %10, align 8, !tbaa !12
  tail call void %11(ptr noundef %0, ptr noundef nonnull %.013)
  br label %12

12:                                               ; preds = %9, %.lr.ph
  %13 = getelementptr inbounds i8, ptr %.013, i64 32
  %.not = icmp eq ptr %13, %5
  br i1 %.not, label %._crit_edge, label %.lr.ph
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef ptr @_ZN8ImVectorI16ImGuiContextHookE5beginEv(ptr noundef nonnull align 8 dereferenceable(16)) local_unnamed_addr #1 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef ptr @_ZN8ImVectorI16ImGuiContextHookE3endEv(ptr noundef nonnull align 8 dereferenceable(16)) local_unnamed_addr #1 align 2

attributes #0 = { mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { inlinehint mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !10, i64 4}
!6 = !{!"_ZTS16ImGuiContextHook", !7, i64 0, !10, i64 4, !7, i64 8, !11, i64 16, !11, i64 24}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"_ZTS20ImGuiContextHookType", !8, i64 0}
!11 = !{!"any pointer", !8, i64 0}
!12 = !{!6, !11, i64 16}


; Effective O3 passes: CorrelatedValuePropagationPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass