[Bug libstdc++/116494] std::string::replace uses memcpy incorrectly and warns about it

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116494

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes. It's a false positive warning about unreachable dead code. We have dozens
of these warnings for -Wrestrict, -Wstringop-overflow, and related warnings.