[clang] [clang] Improve `_Alignas` on a `struct` declaration diagnostic (PR #65638)

[Erich Keane via cfe-commits]

================
@@ -186,14 +186,14 @@ class AttributeCommonInfo {
   bool isGNUScope() const;
   bool isClangScope() const;
 
-  bool isCXX11Attribute() const { return SyntaxUsed == AS_CXX11 || IsAlignas; }
-
+  bool isAlignas() const { return IsAlignas; }
+  bool isCXX11Attribute() const { return SyntaxUsed == AS_CXX11; }
   bool isC23Attribute() const { return SyntaxUsed == AS_C23; }
 
   /// The attribute is spelled [[]] in either C or C++ mode, including standard
   /// attributes spelled with a keyword, like alignas.
   bool isStandardAttributeSyntax() const {
-    return isCXX11Attribute() || isC23Attribute();
+    return isCXX11Attribute() || isC23Attribute() || IsAlignas;
----------------
erichkeane wrote:

So THIS one I definitely think shouldn't change.  BUT this shows another 
situation where `isCXX11Attribute` is being misused.

https://github.com/llvm/llvm-project/pull/65638
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