[PATCH] Use WinEHPrepare to outline SEH finally blocks

[Reid Kleckner]

I added support for catch-all, but I didn't end up handling the case where the catch BB contains interesting code. My reasoning was that EH preparation should be identifying that as a cleanup, and we'll need to do something to handle it for C++.


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  rL LLVM

http://reviews.llvm.org/D8370

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