[llvm] [ConstraintElim] Drop invalid rows instead of failing the elimination (PR #76299)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

Interesting find!

> See also https://github.com/dtcxzyw/llvm-opt-benchmark/issues/35#issuecomment-1868362725.

I am curious how you use this to spot regressions and if there's anything to automate? 

The tests have been split out to a separate commit, but will get squashed on merge. Could you do a separate PR for the tests? Or commit them directly with the suggested adjustment?

https://github.com/llvm/llvm-project/pull/76299