[PATCH] [InstCombine] Fix wrong folding of constant comparisons involving ashr and negative values (PR21222).

[Phabricator]

Closed by commit rL219406 (authored by adibiagio).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D5700

Files:
  llvm/trunk/lib/Transforms/InstCombine/InstCombineCompares.cpp
  llvm/trunk/test/Transforms/InstCombine/icmp-shr.ll
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