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

[Nick Desaulniers via llvm-commits]

nickdesaulniers wrote:

@rnk found https://reviews.llvm.org/D140893 which may have inadvertently exposed a layering violation between Passes and Codegen.

cc @aeubanks @sparker-arm 

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