[llvm] [CodeGen] Let RDA recompute live-ins. (PR #166773)

[Mikhail Gudim via llvm-commits]

mgudim wrote:

I am not sure that this is a proper way to solve the problem. My concern is that `RDA` is an analysis pass, but it may modify MIR by adding live-ins for every block. I suspect it could be a problem.

Please suggest other approaches if you have any ideas!

https://github.com/llvm/llvm-project/pull/166773