[PATCH] IR: Fold away compares between GV GEPs and GVs

[David Majnemer]

Hi nlewycky,

A GEP of a non-weak global variable will not be equivalent to another
non-weak global variable or a GEP of such a variable.

http://reviews.llvm.org/D4238

Files:
  lib/IR/ConstantFold.cpp
  test/Other/constant-fold-gep.ll
  test/Transforms/InstCombine/2010-03-03-ExtElim.ll
  test/Transforms/InstCombine/pr20079.ll
  test/Transforms/LoopVectorize/if-conversion.ll
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