[PATCH] Look through addrspacecasts when turning ptr comparisons into index comparisons.

[Matt Arsenault]

Fix after r210375. With the addrspacecast and bitcast split, this now needs to look through 2 levels of casts

http://reviews.llvm.org/D2593

Files:
  lib/Transforms/InstCombine/InstCombineCompares.cpp
  test/Transforms/InstCombine/icmp.ll
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