[PATCH] [x86] generalize reassociation optimization in machine combiner to 2 instructions

[Sanjay Patel]

Patch updated based on Gerolf's feedback. See previous inline comments and replies.


http://reviews.llvm.org/D10460

Files:
  include/llvm/Target/TargetInstrInfo.h
  lib/CodeGen/MachineCombiner.cpp
  lib/Target/AArch64/AArch64InstrInfo.cpp
  lib/Target/AArch64/AArch64InstrInfo.h
  lib/Target/X86/X86InstrInfo.cpp
  lib/Target/X86/X86InstrInfo.h
  test/CodeGen/X86/fp-fast.ll
  test/CodeGen/X86/machine-combiner.ll

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