[PATCH] [x86] add a reassociation optimization to increase ILP via the MachineCombiner pass

[Sanjay Patel]

Patch updated; see previous inline comments and replies.


http://reviews.llvm.org/D10321

Files:
  lib/Target/X86/X86InstrInfo.cpp
  lib/Target/X86/X86InstrInfo.h
  lib/Target/X86/X86TargetMachine.cpp
  test/CodeGen/X86/fp-fast.ll

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