[PATCH] MachineCopyPropagation: Remove the copies instead of using KILL instructions.

[Phabricator]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10117

Files:
  llvm/trunk/lib/CodeGen/MachineCopyPropagation.cpp
  llvm/trunk/lib/CodeGen/VirtRegMap.cpp
  llvm/trunk/test/CodeGen/X86/avx512-vec-cmp.ll
  llvm/trunk/test/CodeGen/X86/critical-anti-dep-breaker.ll
  llvm/trunk/test/CodeGen/X86/vec_fp_to_int.ll
  llvm/trunk/test/CodeGen/X86/vector-shuffle-256-v4.ll
  llvm/trunk/test/CodeGen/X86/vector-zext.ll

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