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

[Serge Pavlov]

  Patch updated according to reviewer's notes.

Hi bkramer,

http://reviews.llvm.org/D2814

CHANGE SINCE LAST DIFF
  http://reviews.llvm.org/D2814?vs=8397&id=8443#toc

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