[clang] [Clang][Sema] Fix the lambda call expression inside of a type alias declaration (PR #82310)

[via cfe-commits]

================
@@ -313,9 +313,75 @@ Response HandleRecordDecl(const CXXRecordDecl *Rec,
 
   // This is to make sure we pick up the VarTemplateSpecializationDecl that this
   // lambda is defined inside of.
-  if (Rec->isLambda())
+  if (Rec->isLambda()) {
     if (const Decl *LCD = Rec->getLambdaContextDecl())
       return Response::ChangeDecl(LCD);
+    // Attempt to retrieve the template arguments for a using alias declaration.
+    // This is necessary for constraint checking, since we always keep
+    // constraints relative to the primary template.
+    if (ForConstraintInstantiation && !SemaRef.CodeSynthesisContexts.empty()) {
----------------
cor3ntin wrote:

```suggestion
    if (ForConstraintInstantiation) {
```

https://github.com/llvm/llvm-project/pull/82310