[clang] [Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - allow AVX/AVX512 subvector insertion intrinsics to be used in constexpr #157709 (PR #158778)

[Aditya Chaudhari via cfe-commits]

AdityaC4 wrote:

Thanks @RKSimon and @tbaederr for the feedback and reviews, really appreciate the help getting my first LLVM PR across the line 😁

https://github.com/llvm/llvm-project/pull/158778