[PATCH] InstSimplify: Optimize signed icmp of -(zext V)

[David Majnemer]

Closed by commit rL208809 (authored by @majnemer).

http://reviews.llvm.org/D3754

Files:
  llvm/trunk/lib/Analysis/InstructionSimplify.cpp
  llvm/trunk/test/Transforms/InstSimplify/compare.ll
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