[PATCH] [Instcombine] Recognize test for overflow in integer multiplication.

[Serge Pavlov]

  Fixed pattern recognition

  Pattern recognition if fixed for ult comparison. Also added comparisons against MAX+1 value.
  Thanks to Akira Hatanaka!

http://llvm-reviews.chandlerc.com/D2814

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2814?vs=7345&id=7673#toc

Files:
  lib/Transforms/InstCombine/InstCombineCompares.cpp
  test/Transforms/InstCombine/overflow-mul.ll
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