[clang] Add Clang attribute to ensure that fields are initialized explicitly (PR #102040)

[Erich Keane via cfe-commits]

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@@ -4561,6 +4569,13 @@ static void TryConstructorInitialization(Sema &S,
 
   CXXConstructorDecl *CtorDecl = cast<CXXConstructorDecl>(Best->Function);
   if (Result != OR_Deleted) {
+    if (!IsListInit && Kind.getKind() == InitializationKind::IK_Default &&
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erichkeane wrote:

Ok, perhaps I'm missing something here... how do we know that a field marked 
with the attribute wasn't initialized here?  

Also, we have `DestRecordDecl`, so we have access to the `FieldDecl`s 
associated with it, right?

https://github.com/llvm/llvm-project/pull/102040
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