[llvm] [CodeGen] DetectDeadLanes: do not rewrite operand flags on bundles (PR #222124)

[Jake Daly via llvm-commits]

jakemdaly wrote:

> @jakemdaly do you agree that this is an issue? This PR would basically nullify your change.

Hm hadn't seen the headerless version, yes I do see the issue. I can try to find some time to look into doing a more proper bunder analysis

https://github.com/llvm/llvm-project/pull/222124