[Bug libstdc++/108288] Deadlock when using -fno-elide-constructor + -D_GLIBCXX_DEBUG=1 + -std=c++11

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108288

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
__gnu_debug::_Safe_iterator_base::_M_detach in debug.cc isn't affected by the
patch though.

The fix is to the post-inc and post-dec members, so only the code that calls
those needs to be recompiled.