[clang] Reapply "[Clang] Transform lambda's constraints when instantiating parameter mapping (PR #207966)

[Matheus Izvekov via cfe-commits]

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@@ -1002,8 +1005,13 @@ ExprResult ConstraintSatisfactionChecker::EvaluateSlow(
       const_cast<NamedDecl *>(Template), Constraint.getSourceRange());
 
   TemplateArgumentListInfo OutArgs(Ori->LAngleLoc, Ori->RAngleLoc);
-  if (S.SubstTemplateArguments(Ori->arguments(), *SubstitutedArgs, OutArgs) ||
-      Trap.hasErrorOccurred()) {
+
+  if (ConceptId == TopLevelConceptId) {
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mizvekov wrote:

A ConceptReference is a weird object that doesn't fit established AST conventions, so I wonder what does it mean for a `ConceptReference` to be the same as another one?

https://github.com/llvm/llvm-project/pull/207966