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[v3] libstdc++/46455 - fix mutex and condvar leaks


This change adds destructors to the mutex types in the library, it's
not trivial and could do with more testing on platforms where thread
model != posix.  I hacked the gthr headers to reproduce leaks under
valgrind and think I've tested all the code paths, but I don't have
anything suitable to add to the testsuite.

        PR libstdc++/46455
        * include/std/mutex: Define destructors for mutex types which use an
        init function.
        * include/ext/concurrence.h: Likewise.

Tested x86_64-linux, I plan to commit this to trunk in the next day or two.

Attachment: pr46455-full.txt
Description: Text document


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