[llvm] [RegAllocEvictAdvisor] Add minimum weight ratio heuristic. (PR #98109)

[Quentin Colombet via llvm-commits]

https://github.com/qcolombet commented:

My general comment didn't change.
I'm not questioning that you're getting better results in your benchmark, but I still would like to understand why this is the case.
These numbers seem still too magic to me.

https://github.com/llvm/llvm-project/pull/98109