[PATCH] Select Elimination in InstCombine

[Gerolf Hoflehner]

The most notable change is a minor refactoring introducing
replacedSelectWithOperand() that replaces a select with one
of its operands when possible. Refactoring includes the follow-up on good
suggestions like Use isZero() (David), employ users() iterator (Chandler)
and hoist equality check (Hal).

http://reviews.llvm.org/D5258

Files:
  lib/Transforms/InstCombine/InstCombine.h
  lib/Transforms/InstCombine/InstCombineCompares.cpp
  lib/Transforms/InstCombine/InstructionCombining.cpp
  test/Transforms/InstCombine/pr12338.ll
  test/Transforms/InstCombine/select-cmp-br.ll
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