Nick Lewycky 529de8a457 Update the block cloner which fixes bugpoint on code using unwind_to (phew!)
and also update the cloning interface's major user, the loop optimizations.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48088 91177308-0d34-0410-b5e6-96231b3b80d8
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