[PATCH] Kill some duplicated code for removing unreachable BBs.

[Peter Collingbourne]

    - Add a test case

Hi eugenis,

http://llvm-reviews.chandlerc.com/D1334

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1334?vs=3302&id=3330#toc

Files:
  lib/Transforms/Scalar/SimplifyCFGPass.cpp
  lib/Transforms/Utils/Local.cpp
  test/Instrumentation/DataFlowSanitizer/args-unreachable-bb.ll
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