[PATCH] Remove seemingly dead InstCombine compare code

[Matt Arsenault]

Turn check / insert cast into assertions that the sizes are the same. Add some more tests to try to break it. These paths seemed to not be tested with a datalayout. This checks if it needs to cast GEP indices, but at this point they should have already been converted to the pointer sized integer.


http://llvm-reviews.chandlerc.com/D1261

Files:
  lib/Transforms/InstCombine/InstCombineCompares.cpp
  test/Transforms/InstCombine/getelementptr.ll
  test/Transforms/InstCombine/icmp.ll
  test/Transforms/InstCombine/load-cmp.ll
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