[Bug libstdc++/114821] _M_realloc_append should use memcpy instead of loop to copy data when possible

[hubicka at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114821

--- Comment #14 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Jonathan, is there some problem with your patch?