[llvm-branch-commits] [llvm] [ConstantFolding] Add constant folding for mask.beforefirst (PR #234472)

[Paul Walker via llvm-branch-commits]

https://github.com/paulwalker-arm approved this pull request.

The PR matches the current design and I'm happy to defer the poison conversation.  Please do consider the "create ConstantInts early" suggestion if you feel it has merit.

https://github.com/llvm/llvm-project/pull/234472