[PATCH] Allow ScalarEvolution to catch more min/max cases

[Johannes Doerfert]

Hi sunfish, atrick, bkramer,

  For the test case attached different types are used in the ICmpInst
  and SelectInst that represent the min/max expressions. However, if the
  ICmpInst type is smaller a comparison with the sign/zero extended
  operands would have yielded the same result. This situation might arise after
  the instruction combination pass was applied.

http://reviews.llvm.org/D7338

Files:
  lib/Analysis/ScalarEvolution.cpp
  test/Analysis/ScalarEvolution/min-max-exprs.ll

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