Import new fix from libcxxrt. This fixes the case where you attempt to rethrow
an exception when you haven't caught one. This is largely a cosmetic fix, as
(unless you have a very unusual terminate

Import new fix from libcxxrt. This fixes the case where you attempt to rethrow
an exception when you haven't caught one. This is largely a cosmetic fix, as
(unless you have a very unusual terminate handler installed) it will print a
nice error and then abort, rather than just aborting.

MFC after: 7 days

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Fix libcxxrt / libc++ build with the clang in head.

Pointy hat to: theraven

Merge new version of libcxxrt. This brings in three fixes:

- Don't treat pointers to members as pointers in catch blocks (they're usually
fat pointers).

- Correctly catch foreign exceptions in c

Merge new version of libcxxrt. This brings in three fixes:

- Don't treat pointers to members as pointers in catch blocks (they're usually
fat pointers).

- Correctly catch foreign exceptions in catchalls.

- Ensure that a happens-before relationship is established when setting
terminate handlers in one thread and calling them in another.

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