[clang] [clang][Sema] Add checks for validity of default ctor's class (PR #78898)

[Aaron Ballman via cfe-commits]

================
@@ -5990,6 +5990,10 @@ void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) 
{
 
   if (CXXConstructorDecl *Constructor
       = dyn_cast<CXXConstructorDecl>(CDtorDecl)) {
+    if (CXXRecordDecl *ClassDecl = Constructor->getParent();
+        !ClassDecl || ClassDecl->isInvalidDecl()) {
+      return;
+    }
----------------
AaronBallman wrote:

```suggestion
    if (CXXRecordDecl *ClassDecl = Constructor->getParent();
        !ClassDecl || ClassDecl->isInvalidDecl())
      return;
```

https://github.com/llvm/llvm-project/pull/78898
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