SimplifyCFG: turn recursive GatherConstantCompares into iterative

A long sequence of || or && could lead to a stack explosion.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222384 91177308-0d34-0410-b5e6-96231b3b80d8
Fix Use-of-uninitialized-value for adrp_addr and adrp_inst in MachODump.cpp

Fixes PR21607


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222385 91177308-0d34-0410-b5e6-96231b3b80d8