[Bug libstdc++/62258] [4.9/5 Regression] uncaught_exception() equals to `true' after rethrow_exception()

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62258

--- Comment #22 from Jonathan Wakely <redi at gcc dot gnu.org> ---
For the record, the 4.8.3 regression was introduced by r207131 and the 4.7.4
regression by r208991, with the fixes for PR 41174 and PR 59224.

The fix should apply cleanly and be safe for the 4.7 and 4.8 branches (although
they are closed upstream of course).