[PATCH] Remove redundent register mov by improving TwoAddressInstructionPass

[Wei Mi]

Address Chandler's comments:

1. change the comments to doxygen format.
2. Add a FIXME in the code and file a PR to track the problems that havn't been addressed: http://llvm.org/bugs/show_bug.cgi?id=22689


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7806

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

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