[PATCH] Remove redundent register mov by improving TwoAddressInstructionPass

[Wei Mi]

Thanks. I rewrited the CHECKs for the test.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7806

Files:
  lib/CodeGen/TwoAddressInstructionPass.cpp
  test/CodeGen/X86/twoaddr-coalesce-3.ll

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