[Bug target/80325] _mm512_undefined intrinsic missing

[mail@sven-woop.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80325

--- Comment #2 from Sven Woop <mail@sven-woop.de> ---
For AVX512 the Intel Intrinsics guide also mentioned the _mm512_undefined as
alias for _mm512_undefined_ps.

https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm512_undefined&techs=AVX_512

ICC and Clang support _mm512_undefined.