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

[bugdal at aerifal dot cx via Gcc-bugs]

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

--- Comment #60 from Rich Felker <bugdal at aerifal dot cx> ---
Nobody said anything about writing past end of buffer. Obviously you can't do
that.