[clang] [Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - allow insertps intrinsic to be used in constexp (PR #165513)

[Simon Pilgrim via cfe-commits]

https://github.com/RKSimon requested changes to this pull request.

Thanks - the single callback approach looks better to me

https://github.com/llvm/llvm-project/pull/165513