[PATCH] SimplifyCFG: recognise and simplify more no-op resumes.

[Peter Collingbourne]

    - Don't try to delete the blocks ourselves as we can get it wrong in some cases, instead let SimplifyCFG do it.

Hi baldrick,

http://llvm-reviews.chandlerc.com/D563

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D563?vs=1347&id=1466#toc

Files:
  lib/Transforms/Utils/SimplifyCFG.cpp
  test/Transforms/SimplifyCFG/TrivialLPads.ll
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