[llvm] [ConstraintElim] Handle switch cases with the same destination (PR #76928)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

I don't think this is a good fit for ConstraintElimination. I'd expect either IPSCCP or CVP to optimize such cases. If they don't, we should fix it there.

https://github.com/llvm/llvm-project/pull/76928