[polly] [TargetLowering] remove unused virtual from ComputeConstraintToUse (PR #67171)

[Petr Hosek via llvm-commits]

petrhosek wrote:

> @petrhosek do you think there's a better way than adding these linkage dependencies? Perhaps some definitions need to be moved from somewhere to somewhere else? Perhaps that's a bigger yak shave?

Do you know where is the dependency on `ComputeConstraintToUse` coming from in all those targets?

https://github.com/llvm/llvm-project/pull/67171