[PATCH] IR: add failure ordering to the cmpxchg instruction

[Tim Northover]

Hi all,

After getting a couple of positive responses to the proposal to add a second ordering parameter to the "cmpxchg" instruction, to model C++11 operations, I've polished the patches up and would like to commit.

Does it look reasonable? The main detail I'm unsure of is: should I have bumped some .bc version field up, or did we stop doing that? Nothing jumped out at me.

Cheers.

Tim.

http://llvm-reviews.chandlerc.com/D3023

Files:
  docs/LangRef.rst
  include/llvm/CodeGen/SelectionDAG.h
  include/llvm/CodeGen/SelectionDAGNodes.h
  include/llvm/IR/IRBuilder.h
  include/llvm/IR/Instructions.h
  lib/Analysis/AliasAnalysis.cpp
  lib/AsmParser/LLParser.cpp
  lib/AsmParser/LLParser.h
  lib/Bitcode/Reader/BitcodeReader.cpp
  lib/Bitcode/Writer/BitcodeWriter.cpp
  lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
  lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/IR/AsmWriter.cpp
  lib/IR/AsmWriter.h
  lib/IR/Instruction.cpp
  lib/IR/Instructions.cpp
  lib/IR/Verifier.cpp
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/CppBackend/CPPBackend.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Transforms/IPO/MergeFunctions.cpp
  lib/Transforms/Instrumentation/MemorySanitizer.cpp
  lib/Transforms/Instrumentation/ThreadSanitizer.cpp
  test/Assembler/atomic.ll
  test/Bitcode/cmpxchg-upgrade.ll
  test/Bitcode/cmpxchg-upgrade.ll.bc
  test/Bitcode/memInstructions.3.2.ll
  test/CodeGen/AArch64/atomic-ops.ll
  test/CodeGen/ARM/atomic-64bit.ll
  test/CodeGen/ARM/atomic-cmp.ll
  test/CodeGen/ARM/atomic-ops-v8.ll
  test/CodeGen/Mips/atomic.ll
  test/CodeGen/Mips/atomicops.ll
  test/CodeGen/PowerPC/Atomics-32.ll
  test/CodeGen/PowerPC/Atomics-64.ll
  test/CodeGen/PowerPC/atomic-1.ll
  test/CodeGen/PowerPC/atomic-2.ll
  test/CodeGen/SPARC/atomics.ll
  test/CodeGen/SystemZ/cmpxchg-01.ll
  test/CodeGen/SystemZ/cmpxchg-02.ll
  test/CodeGen/SystemZ/cmpxchg-03.ll
  test/CodeGen/SystemZ/cmpxchg-04.ll
  test/CodeGen/X86/2010-10-08-cmpxchg8b.ll
  test/CodeGen/X86/Atomics-64.ll
  test/CodeGen/X86/atomic16.ll
  test/CodeGen/X86/atomic32.ll
  test/CodeGen/X86/atomic64.ll
  test/CodeGen/X86/atomic6432.ll
  test/CodeGen/X86/atomic8.ll
  test/CodeGen/X86/atomic_op.ll
  test/CodeGen/X86/cmpxchg16b.ll
  test/CodeGen/X86/coalescer-remat.ll
  test/CodeGen/X86/nocx16.ll
  test/Instrumentation/AddressSanitizer/test64.ll
  test/Instrumentation/MemorySanitizer/atomics.ll
  test/Instrumentation/ThreadSanitizer/atomic.ll
  test/Transforms/LowerAtomic/atomic-swap.ll
  test/Transforms/SimplifyCFG/trapping-load-unreachable.ll
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