[clang] [Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - Allow GFNI intrinsics to be used in constexpr (PR #169619)

[Simon Pilgrim via cfe-commits]

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@@ -74,4 +77,9 @@ void HandleComplexComplexDiv(llvm::APFloat A, llvm::APFloat B, llvm::APFloat C,
 CharUnits GetAlignOfExpr(const ASTContext &Ctx, const Expr *E,
                          UnaryExprOrTypeTrait ExprKind);
 
+uint8_t GFNIMultiplicativeInverse(uint8_t Byte);
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RKSimon wrote:

x86 might end up with some additional gfni folds at some point, I don't know if any other targets have an identical instruction 

https://github.com/llvm/llvm-project/pull/169619