[PATCH] Removed pattern checks in instruction simplify/ combine which are now handled in SimplifyUsingDistributiveLaws()

[Dinesh Dwivedi]

Hi bkramer, rafael, jingyue, nicholas,

This patch removed duplicate code for matching patterns which are not handled in SimplifyUsingDistributiveLaws() (after r211261)

http://reviews.llvm.org/D4253

Files:
  lib/Analysis/InstructionSimplify.cpp
  lib/Transforms/InstCombine/InstCombineAddSub.cpp
  test/Transforms/InstCombine/distribute.ll
  test/Transforms/InstSimplify/2010-12-20-Distribute.ll
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