[clang] [Clang][C++26] Implement "Ordering of constraints involving fold expressions (PR #98160)

[Aaron Ballman via cfe-commits]

================
@@ -177,77 +178,180 @@ struct SatisfactionStackRAII {
 };
 } // namespace
 
-template <typename AtomicEvaluator>
+template <typename ConstraintEvaluator>
 static ExprResult
 calculateConstraintSatisfaction(Sema &S, const Expr *ConstraintExpr,
                                 ConstraintSatisfaction &Satisfaction,
-                                AtomicEvaluator &&Evaluator) {
-  ConstraintExpr = ConstraintExpr->IgnoreParenImpCasts();
+                                ConstraintEvaluator &&Evaluator);
 
-  if (LogicalBinOp BO = ConstraintExpr) {
-    size_t EffectiveDetailEndIndex = Satisfaction.Details.size();
-    ExprResult LHSRes = calculateConstraintSatisfaction(
-        S, BO.getLHS(), Satisfaction, Evaluator);
+template <typename ConstraintEvaluator>
+static ExprResult calculateConstraintSatisfaction(
+    Sema &S, const Expr *LHS, OverloadedOperatorKind Op, const Expr *RHS,
+    ConstraintSatisfaction &Satisfaction, ConstraintEvaluator &Evaluator) {
+  size_t EffectiveDetailEndIndex = Satisfaction.Details.size();
 
-    if (LHSRes.isInvalid())
-      return ExprError();
+  ExprResult LHSRes =
+      calculateConstraintSatisfaction(S, LHS, Satisfaction, Evaluator);
----------------
AaronBallman wrote:

`std::forward(Evaluator)`?

https://github.com/llvm/llvm-project/pull/98160
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