[Bug target/103017] Fix redundant check in aut insn generation

[ashimida at linux dot alibaba.com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103017

--- Comment #1 from ashimida <ashimida at linux dot alibaba.com> ---
Submitted at
https://gcc.gnu.org/pipermail/gcc-patches/2021-November/582997.html