[PATCH] [OPENMP] llvm.loop.vectorize.enable metadata are lost after critical edge splitting

[Johannes Doerfert]

I'm not completely sure but this sounds similar to what I did a couple
of weeks ago (http://reviews.llvm.org/D5344) however I didn't force
LoopInfo to be present but rather handled the case it isn't. For the
record, I don't know the benefits/drawbacks for either.

If we use your patch we could possibly add my test cases.

- {F191474, layout=link}

http://reviews.llvm.org/D5539