[clang] [Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - Allow PSLL/PSRA/PSRL var intrinsics to be used in constexpr (PR #169276)

[Simon Pilgrim via cfe-commits]

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

Remove __anyext128 def from mmintrin.h?

https://github.com/llvm/llvm-project/pull/169276