[llvm-branch-commits] [llvm] [llubi] Add support for `bitinsert` and `bitextract` (PR #230827)

[Pedro Lobo via llvm-branch-commits]

pedroclobo wrote:

gh won't let me stack this on top of #230819 because it has auto-merged enabled. I'll rebase once #230819 lands. It is needed for `%bitinsert_poison = bitinsert b32 0, i16 poison, i32 4` to not trigger the assert.

https://github.com/llvm/llvm-project/pull/230827