[Bug libstdc++/77619] uninitialized_meow_construct and friends not exception safe

[ville.voutilainen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77619

--- Comment #2 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
Patch available: https://gcc.gnu.org/ml/gcc-patches/2016-09/msg01131.html