Please backport 905abc5b7db2 to 14.0.0

[rotateright]

This is an enhancement that would prevent perf regressions from the previous release for x86 with AVX512.
See discussion in:
https://reviews.llvm.org/D113442

Earlier commits in this series have already been backported:
6592bce (main) -> a2f5832 (branch)
a68e098 (main) -> ae88d88 (branch)

[rotateright]

/cherry-pick 905abc5

[llvmbot]

Failed to cherry-pick: 905abc5

https://github.com/llvm/llvm-project/actions/runs/1848650549

Please manually backport the fix and push it to your github fork. Once this is done, please add a comment like this:

/branch <user>/<repo>/<branch>

[rotateright]

I missed a test file update that happened between the code changes.
Trying again:
/cherry-pick 24562ba 905abc5

[llvmbot]

/branch llvmbot/llvm-project/issue53866

[llvmbot]

/pull-request llvmbot#67

[tstellar]

Merged: 6311bae b0ae807