https://reviews.llvm.org/D27769


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Our support for C++ EH is sufficiently good that it makes sense to
enable support for it out of the box.

While we are here, update the MSVCCompatibility doc.

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- Fix the formatting of the "Exceptions and SEH" section.
- Make the "Complete" text for "Thread-safe initialization of local
  statics" green.

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The MSVC 2015 ABI utilizes a rather straightforward adaptation of the
algorithm found in the appendix of N2382.  While we are here, implement
support for emitting cleanups if an exception is thrown while we are
intitializing a static local variable.

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Rethrowing exceptions in the MS model is very simple: just call
_CxxThrowException with nullptr for both arguments.

N.B.  They chose stdcall as the calling convention for x86 but cdecl for
all other platforms.

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The document should reflect that we now support emission for DWARF.

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Make the status text for lambdas green.

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Also removed a sentance that was no longer relevant.




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It hasn't been updated to reflect the progress we've made.  We've fuzz
tested VFTables, VBTables, layout, and RTTI data.  We support lambdas
that are compatible with their scheme.

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This documents some of the status of supported functionality in MSVC
quirks mode.  Some of this should be in
http://clang.llvm.org/compatibility.html instead when things have
stabilized.

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