[Bug target/104611] memcmp/strcmp/strncmp can be optimized when the result is tested for [in]equality with 0 on aarch64

[zhongyunde at huawei dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104611

--- Comment #3 from vfdff <zhongyunde at huawei dot com> ---
  As the load instructions usually have long latency, so do it need some extra
restrict when we try this transformation?