[Bug middle-end/124471] [AVR] Counterproductive byte copy optimization by multiplication

[dimich.dmb at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124471

--- Comment #3 from Dmytro Bagrii <dimich.dmb at gmail dot com> ---
When argument is 16-bit, AVR optimizes it as expected as well:

uint16_t clone(uint16_t n) {
    return  (n & 0xFF) | (n << 8);
}


<clone>:
        98 2f           mov     r25, r24
        08 95           ret