[PATCH] [SimplifyCFG] Revise common code sinking

[Michael Liao]

- Fix the case where more than 1 common instructions derived from the same operand cannot be sunk

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6688

Files:
  lib/Transforms/Utils/SimplifyCFG.cpp
  test/Transforms/SimplifyCFG/sink-common-code.ll

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