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

[Luke Lau via llvm-branch-commits]

lukel97 wrote:

> 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.

Ack, will implement later this evening. Also happy to open up the poison discussion, I'm mostly glad that we're paying attention to poison semantics properly now

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