[Bug middle-end/121146] memcpy does not recognize alignas

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121146

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Adding:

    x = (B*)__builtin_assume_aligned (x, 16);
    y = (B*)__builtin_assume_aligned (y, 16);

At the begining of the function fixes the issue ...

There might be another bug about memcpy with arguments too ...