x86/lib/memcpy_64.S: Convert memcpy to ALTERNATIVE_2 macro
x86/lib/memcpy_64.S: Convert memcpy to ALTERNATIVE_2 macro

Make REP_GOOD variant the default after alternatives have run.

Signed-off-by: Borislav Petkov <0691a664b24b6f15b20cd5aee64b72271db08be1@suse.de>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs