[llvm] [ConstraintElim] Use ConstantRange information for ConstraintElimination (PR #180862)

[Nikita Popov via llvm-commits]

nikic wrote:

Looks like the compile-time cost of doing this is very high: https://github.com/dtcxzyw/llvm-opt-benchmark/pull/3454#issuecomment-3881987708 (I expect this is due to the added constraints, not due to computeConstantRange.)

https://github.com/llvm/llvm-project/pull/180862