__cxa_current_exception_type

[Jason Merrill]

Since we use type_infos in the exception handling mechanism, it seems
reasonable to allow user code (specifically terminate_handlers) to be able
to get at this information.  This is already possible by examining the
contents of __cxa_get_globals, but that requires knowing the layout of
__cxa_eh_globals.  It seems to me that it makes sense to provide another
entry point to get just this information.  ABI patch and implementation
attached.

It seems reasonable to me to add this even now, since it's a pure
extension; people can add it to their runtimes at their leisure.  Thoughts?

Jason

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