[PATCH] Add a flag to experiment with outlining optional branches.

[Chandler Carruth]

I'm not sure this is exactly the right *heuristic*, but the code is fine and I really want to get it into the tree because it highlights fundamental flaws in the existing MBP algorithm that you've found. The flag is off by default and only requires a domtree, so I think it is entirely reasonable to commit. We can and should experiment with this off-by-default heuristic, learn what we can, and either fix and enable it or replace it with a better construct.


http://reviews.llvm.org/D7719

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