Add the majority of machine-level critical edge breaking pass.  Most of this was written by Fernando, cleanup and updating to TOT by me.

This still needs a bit of work, particularly to handle jump tables properly.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43885 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed