8362151: Remove unnecessary ClassLoaderDataGraph friend classes

Reviewed-by: coleenp, shade

Author: Thomas Schatzl

src/hotspot/share/classfile/classLoaderData.hpp

@@ -97,11 +97,7 @@ class ClassLoaderData : public CHeapObj<mtClass> {
   };
 
   friend class ClassLoaderDataGraph;
-  template <bool keep_alive>
-  friend class ClassLoaderDataGraphIteratorBase;
   friend class ClassLoaderDataGraphKlassIteratorAtomic;
-  friend class ClassLoaderDataGraphKlassIteratorStatic;
-  friend class ClassLoaderDataGraphMetaspaceIterator;
   friend class Klass;
   friend class MetaDataFactory;
   friend class Method;

src/hotspot/share/classfile/classLoaderDataGraph.hpp

@@ -34,9 +34,7 @@
 
 class ClassLoaderDataGraph : public AllStatic {
   friend class ClassLoaderData;
-  friend class ClassLoaderDataGraphMetaspaceIterator;
   friend class ClassLoaderDataGraphKlassIteratorAtomic;
-  friend class ClassLoaderDataGraphKlassIteratorStatic;
   friend class VMStructs;
  private:
   class ClassLoaderDataGraphIterator;