[clang] Issue #162051: [X86][Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - add AVX512 KTEST/KORTEST intrinsics to be used in constexpr (PR #166103)

[Simon Pilgrim via cfe-commits]

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

Still missing handling in ExprConstant.cpp VisitBuiltinCallExpr - we currently have 2 expression interpreters to support 

https://github.com/llvm/llvm-project/pull/166103