[PATCH] [X86] Memory folding for commutative instructions (updated)

[Simon Pilgrim]

Memory folding patch - added filecheck tests to main regression test (renamed fold-tied-op.ll)

http://reviews.llvm.org/D5818

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