[clang] [Clang] support friend declarations with a dependent nested-name-specifier (PR #191268)

[Matheus Izvekov via cfe-commits]

================
@@ -2524,19 +2523,12 @@ class FriendTemplateDecl : public Decl {
     return Friend.dyn_cast<NamedDecl*>();
   }
 
-  /// Retrieves the location of the 'friend' keyword.
-  SourceLocation getFriendLoc() const {
-    return FriendLoc;
+  TemplateParameterList *getFriendTypeTemplateParameterList(unsigned N) const {
+    assert(N < NumTPLists);
+    return getTrailingObjects()[N];
   }
 
-  TemplateParameterList *getTemplateParameterList(unsigned i) const {
-    assert(i <= NumParams);
-    return Params[i];
-  }
-
-  unsigned getNumTemplateParameters() const {
-    return NumParams;
-  }
+  unsigned getFriendTypeNumTemplateParameterLists() const { return NumTPLists; }
----------------
mizvekov wrote:

Since you are changing this already, make a single method that returns an ArrayRef instead?

https://github.com/llvm/llvm-project/pull/191268