[clang] [Clang] Warn when an explicit alignment is weakened by other directives (PR #198417)

[Aaron Ballman via cfe-commits]

================
@@ -2047,6 +2055,13 @@ void ItaniumRecordLayoutBuilder::LayoutField(const FieldDecl *D,
 
   CharUnits AlignTo =
       !DefaultsToAIXPowerAlignment ? FieldAlign : PreferredAlign;
+
+  if (!MaxAlignmentInChars.isZero() && MaxAlignmentInChars > AlignTo) {
+    Diag(D->getLocation(), diag::warn_explicit_alignment_weakened)
+        << D->getName() << MaxAlignmentInChars.getQuantity()
----------------
AaronBallman wrote:

```suggestion
        << D << MaxAlignmentInChars.getQuantity()
```

https://github.com/llvm/llvm-project/pull/198417