[PATCH] [X86] Memory folding for commutative instructions.

[Simon Pilgrim]

Hi Quentin,

I've added error handling code for commuteInstruction returning nullptr or a new MachineInstr*, both before and after the commuted folding attempt. This appears to be enough and we don't need to alter either the commute or folding call arguments to support it - we can keep to in-place instruction commutes only.

Simon.

http://reviews.llvm.org/D5701

Files:
  lib/Target/X86/X86FastISel.cpp
  lib/Target/X86/X86InstrInfo.cpp
  lib/Target/X86/X86InstrInfo.h
  test/CodeGen/X86/avx1-stack-reload-folding.ll
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