[PATCH] [Peephole] Advanced rewriting of copies to avoid cross register banks copies.

[Quentin Colombet]

Update according Hal's advices.

Thanks Hal for the feedback BTW.

http://reviews.llvm.org/D4086

Files:
  include/llvm/CodeGen/MachineInstr.h
  lib/CodeGen/PeepholeOptimizer.cpp
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