[Bug middle-end/92492] AVX512: Missed vectorization opportunity

[crazylht at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92492

--- Comment #7 from Hongtao.liu <crazylht at gmail dot com> ---
I notice TARGET_VECTORIZE_RELATED_MODE is added, and can be used to handle
convertion, i'm working on this.