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

[Serge Pavlov]

  Removed unused variables.

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2814?vs=7150&id=7345#toc

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