[llvm] [CodeGen] Ensure clearRegisterKills clears inside bundles. (PR #149177)

[Ricardo Jesus via llvm-commits]

rj-jesus wrote:

> Wonder if the other functions should also operate on bundles or if just this one needs to

I'm not sure, bundle iterators are already used elsewhere (for example in LiveRegUnits::accumulateUsedDefed), but it might be that there are a few places where they are missed or where different strategies are used (for example as @davemgreen suggested).

https://github.com/llvm/llvm-project/pull/149177