[PATCH] [ValueTracking] refactor: extract method noCommonSetBits

[Jingyue Wu]

Hi broune, majnemer, meheff,

Extract method noCommonSetBits so that we don't have to duplicate this logic in
InstCombine and SeparateConstOffsetFromGEP.

This patch also makes SeparateConstOffsetFromGEP more precise by passing
DominatorTree to computeKnownBits.

http://reviews.llvm.org/D9734

Files:
  include/llvm/Analysis/ValueTracking.h
  lib/Analysis/ValueTracking.cpp
  lib/Transforms/InstCombine/InstCombineAddSub.cpp
  lib/Transforms/Scalar/SeparateConstOffsetFromGEP.cpp

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