libstdc++ PATCH for c++/41174, c++/59224, Core DR 475

[Jason Merrill]

DR 475 clarified that uncaught_exception shouldn't return true until we 
are done creating the exception object and enter the unwinder:

http://open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#475

Fixed by moving the adjustment of the uncaughtExceptions count from the 
allocation to the throw.

Tested x86_64-pc-linux-gnu, applying to trunk and 4.8.
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