[llvm-branch-commits] [llvm] [SLP] Handle REVEC when costing expanded compress mask (PR #232810)

[Ryan Buchner via llvm-branch-commits]

https://github.com/bababuck approved this pull request.

LGTM, but best to wait for final approval from Alexey. I did notice on some RISCV x264 runs that there was a slight regression (3-4% range) when enabling `slp-revec`, curious to see if this contributed to that at all.

https://github.com/llvm/llvm-project/pull/232810