Spread some const around for non-mutating uses of MCSymbolData.

I discovered this const-hole while attempting to coalesnce the Symbol
and SymbolMap data structures. There's some pending issues with that,
but I figured this change was easy to flush early.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207124 91177308-0d34-0410-b5e6-96231b3b80d8
R600/SI: Use address space in allowsUnalignedMemoryAccesses

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207126 91177308-0d34-0410-b5e6-96231b3b80d8
[X86] Add support for Read Time Stamp Counter x86 builtin intrinsics.

This patch:
- Adds two new X86 builtin intrinsics ('int_x86_rdtsc' and
   'int_x86_rdtscp') as GCCBuiltin intrinsics;
- Teaches the backend how to lower the two new builtins;
- Introduces a common function to lower READCYCLECOUNTER dag nodes
  and the two new rdtsc/rdtscp intrinsics;
- Improves (and extends) the existing x86 test 'rdtsc.ll'; now test 'rdtsc.ll'
  correctly verifies that both READCYCLECOUNTER and the two new intrinsics
  work fine for both 64bit and 32bit Subtargets.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207127 91177308-0d34-0410-b5e6-96231b3b80d8
Debug info for optimized code: Support variables that are on the stack and
described by DBG_VALUEs during their lifetime.

Previously, when a variable was at a FrameIndex for any part of its
lifetime, this would shadow all other DBG_VALUEs and only a single
fbreg location would be emitted, which in fact is only valid for a small
range and not the entire lexical scope of the variable. The included
dbg-value-const-byref testcase demonstrates this.

This patch fixes this by
Local
- emitting dbg.value intrinsics for allocas that are passed by reference
- dropping all dbg.declares (they are now fully lowered to dbg.values)
SelectionDAG
- renamed constructors for SDDbgValue for better readability.
- fix UserValue::match() to handle indirect values correctly
- not inserting an MMI table entries for dbg.values that describe allocas.
- lowering dbg.values that describe allocas into *indirect* DBG_VALUEs.
CodeGenPrepare
- leaving dbg.values for an alloca were they are (see comment)
Other
- regenerated/updated instcombine-intrinsics testcase and included source


rdar://problem/16679879
http://reviews.llvm.org/D3374

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207130 91177308-0d34-0410-b5e6-96231b3b80d8
[modules] "Specialize" a function by actually specializing a function template
rather than by adding an overload and hoping that it's declared before the code
that calls it. (In a modules build, it isn't.)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207133 91177308-0d34-0410-b5e6-96231b3b80d8
Debug info: Let dbg.values inserted by LowerDbgDeclare inherit the location
of the dbg.value. This gets rid of tons of redundant variable DIEs in
subscopes.

rdar://problem/14874886, rdar://problem/16679936

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207135 91177308-0d34-0410-b5e6-96231b3b80d8
Remove C++11ism (specializing a template in a surrounding namespace) to appease the buildbots.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207136 91177308-0d34-0410-b5e6-96231b3b80d8
Fix rdtsc.ll test to match r8 on win64

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207142 91177308-0d34-0410-b5e6-96231b3b80d8
Add 'musttail' marker to call instructions

This is similar to the 'tail' marker, except that it guarantees that
tail call optimization will occur.  It also comes with convervative IR
verification rules that ensure that tail call optimization is possible.

Reviewers: nicholas

Differential Revision: http://llvm-reviews.chandlerc.com/D3240

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207143 91177308-0d34-0410-b5e6-96231b3b80d8
Remove dead inline function that doesn't compile

MSVC doesn't diagnose this, interestingly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207144 91177308-0d34-0410-b5e6-96231b3b80d8
X86: Don't transform shifts into ands when the sign bit is tested.

Should unbreak MultiSource/Benchmarks/mediabench/g721/g721encode/encode.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207145 91177308-0d34-0410-b5e6-96231b3b80d8
[ADT] Generalize pointee_iterator to smart pointers by using decltype.
Based on review feedback from Dave on the original patch.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207146 91177308-0d34-0410-b5e6-96231b3b80d8
[LCG] Switch a weird do/while loop that actually couldn't fail its
condition into an obviously infinite loop with an assert about the
degenerate condition. No functionality changed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207147 91177308-0d34-0410-b5e6-96231b3b80d8
[DWARF parser] Simplify and re-format a method

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207151 91177308-0d34-0410-b5e6-96231b3b80d8
[DWARF parser] DWARFUnit ctor doesn't need both parsed and raw .debug_abbrev section. Remove the former.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207153 91177308-0d34-0410-b5e6-96231b3b80d8
[DWARF parser] Make a few methods non-public

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207156 91177308-0d34-0410-b5e6-96231b3b80d8
Function defined in a header should be inline. Found by modules build.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207157 91177308-0d34-0410-b5e6-96231b3b80d8
Add missing include, found by modules build.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207158 91177308-0d34-0410-b5e6-96231b3b80d8
Revert "Debug info: Let dbg.values inserted by LowerDbgDeclare inherit the location"

This reverts commit 207130 for buildbot breakage.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207159 91177308-0d34-0410-b5e6-96231b3b80d8
Revert "Debug info for optimized code: Support variables that are on the stack and"

This reverts commit 207130 for buildbot breakage.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207162 91177308-0d34-0410-b5e6-96231b3b80d8