[PATCH] R600/SI: Fix verifier error from a branch on IMPLICIT_DEF

[Matt Arsenault]

SIILowerI1Copies wasn't correctly handling this case.

http://reviews.llvm.org/D5905

Files:
  lib/Target/R600/SILowerI1Copies.cpp
  test/CodeGen/R600/i1-copy-implicit-def.ll
  test/CodeGen/R600/v-cmp-vreg1-src-error.ll
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