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

[Sanjay Patel]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10460

Files:
  llvm/trunk/lib/CodeGen/MachineCombiner.cpp
  llvm/trunk/lib/Target/X86/X86InstrInfo.cpp
  llvm/trunk/test/CodeGen/X86/fp-fast.ll
  llvm/trunk/test/CodeGen/X86/machine-combiner.ll

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