[Bug middle-end/32667] block copy with exact overlap is expanded as memcpy

[sjames at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=32667

--- Comment #40 from Sam James <sjames at gcc dot gnu.org> ---
https://git.musl-libc.org/cgit/musl/tree/src/string/memcpy.c#n5