[clang] [Clang][X86] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - allow VPERMILPD/S variable mask intrinsics to be used in constexpr (PR #168861)

[Yanzuo Liu via cfe-commits]

zwuis wrote:

> Resolves https://github.com/issues/assigned?issue=llvm%7Cllvm-project%7C167878

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https://github.com/llvm/llvm-project/pull/168861