[PATCH] Select Elimination in InstCombine

[Gerolf Hoflehner]

Changes:
- a few more improvements to code readability
- isChainSelectCmpBranch() is now static
- const parameters and variables

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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