[Bug target/102672] [AArch64] Failure to optimize to using stp instead of 2 strs when possible

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102672

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Padding bytes are not zero in some cases and this is the case here.