[clang] [Clang][AST] Track whether template template parameters used the 'typename' keyword (PR #88139)

[Erich Keane via cfe-commits]

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@@ -1634,6 +1640,14 @@ class TemplateTemplateParmDecl final
   using TemplateParmPosition::setPosition;
   using TemplateParmPosition::getIndex;
 
+  /// Whether this template template parameter was declared with
+  /// the 'typename' keyword.
+  bool wasDeclaredWithTypename() const { return Typename; }
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erichkeane wrote:

So these should return the syntax of typename and class rather than a bool.

https://github.com/llvm/llvm-project/pull/88139