[Bug target/81590] AVX512 run-time test failures

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81590

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 41857
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41857&action=edit
A patch to properly check AVX512 features