[PATCH] SEH exceptions on Win64 (clang part)

[Yaron Keren]

Hi martell, nrieck, Kai, vadimcn, asl, rnk,

Patch by Martell Malone.

This adds seh exception handling on the clang side.
For now this will remove link errors regardless if seh is supported on the llvm backend or not.

See   http://reviews.llvm.org/differential/revision/edit/3418/   for the LLVM part of the patch.

http://reviews.llvm.org/D3419

Files:
  include/clang/Basic/LangOptions.def
  include/clang/Driver/CC1Options.td
  include/clang/Driver/ToolChain.h
  lib/CodeGen/CGException.cpp
  lib/Driver/MinGWToolChain.cpp
  lib/Driver/ToolChains.h
  lib/Driver/Tools.cpp
  lib/Frontend/CompilerInvocation.cpp
  lib/Frontend/InitPreprocessor.cpp
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