[Bug middle-end/95556] Not replacing __builtin___memcpy_chk() as documented

[pgsql@j-davis.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95556

--- Comment #7 from Jeff Davis <pgsql@j-davis.com> ---
"...built-in functions are optimized into the normal string functions like
memcpy if the last argument is (size_t) -1..."

My reading of the document lead me to believe that a last argument of -1
*would* be a normal library call. And certainly should be with
-fno-builtin-memcpy, right?

If that's not what's happening, should the document be clarified?