[llvm-commits] Patch for simplifying regions

[Vu Le]

Hi Tobias, Andreas,
This is my patch for regionsimplify pass.
I rename the file to RegionSimplify, change the pass name to -regionsimplify
to conform with those of Loop.

I also update the RegionInfo and DominatorTree whenever we split the entry
or exit.
Please give me the feedbacks.
Thanks.
Vu
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