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

[Simon Pilgrim]

Tidied up check for commutative instructions - we can avoid isCommutable and use findCommutedOpIndices directly and then fold anything that is commutable under certain cases (e.g. FMA instructions).

Added the missing test case.

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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