[PATCH] Teach SplitBlockPredecessors how to handle landingpad blocks.

[Igor Laevsky]

Hi reames,

Currently SplitBlockPredecessors generates incorrect code in case if basic block we are going to split has a landingpad. Also seems like it is fairly common case among it's users to conditionally call either SplitBlockPredecessors or SplitLandingPadPredecessors. Because of this I think it is reasonable to add this condition directly into SplitBlockPredecessors.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7157

Files:
  include/llvm/Transforms/Utils/BasicBlockUtils.h
  lib/Transforms/Scalar/LoopUnswitch.cpp
  lib/Transforms/Utils/BasicBlockUtils.cpp
  lib/Transforms/Utils/LoopSimplify.cpp
  lib/Transforms/Utils/LoopUnrollRuntime.cpp
  test/Transforms/LoopSimplify/2011-12-14-LandingpadHeader.ll

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