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

[via cfe-commits]

================
@@ -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 &&
----------------
higher-performance wrote:

Could we please defer complicated improvements to a future PR? This is taking up much more bandwidth than I had allocated for it, and I really don't have unlimited time to spend on this.

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