[PATCH] SEH exceptions on Win64 (clang part)

[Reid Kleckner]

Is this useful without the LLVM change (http://reviews.llvm.org/D3418)?

It seems like a reasonable step forward for MinGW64 compatibility, but I think the commit message is off.  I think most people will assume "SEH exceptions" means __try { ... } __except (...) { ... }, which is not what this commit covers.  I'd rephrase it to talk about MinGW64 SEH support.

http://reviews.llvm.org/D3419