[PATCH] Select Elimination in InstCombine

[Gerolf Hoflehner]

Updates:
- Follow up on all your great reviews
- Note: patch still assumes that it is OK to enable DT by default
- New change in pr12338: when DT is default all arithmetic instructions in
that test get removed. This is fine. The purpose of the test is to protect
against an inifinite loop in the instruction combiner.

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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