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

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

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

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Created attachment 58014
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58014&action=edit
Make std::pair relocatable and simplify __relocate_a

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