[clang] [Clang] Implement diagnostics for why is_empty is false (PR #145044)

[Aaron Ballman via cfe-commits]

================
@@ -2285,6 +2286,68 @@ static void DiagnoseNonTriviallyCopyableReason(Sema 
&SemaRef,
   SemaRef.Diag(D->getLocation(), diag::note_defined_here) << D;
 }
 
+static void DiagnoseIsEmptyReason(Sema &S, SourceLocation Loc,
+                                  const CXXRecordDecl *D) {
+  // Non-static data members (ignore zero-width bit‐fields).
+  for (auto *Field : D->fields()) {
----------------
AaronBallman wrote:

```suggestion
  for (const auto *Field : D->fields()) {
```

https://github.com/llvm/llvm-project/pull/145044
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