8301164: Remove unused ResourceStack class

Reviewed-by: coleenp

Author: albertnetymk

src/hotspot/share/utilities/stack.hpp

@@ -160,27 +160,6 @@ class Stack:  public StackBase<F>
   E* _cache;      // Segment cache to avoid ping-ponging.
 };
 
-template <class E, MEMFLAGS F> class ResourceStack:  public Stack<E, F>, public ResourceObj
-{
-public:
-  // If this class becomes widely used, it may make sense to save the Thread
-  // and use it when allocating segments.
-//  ResourceStack(size_t segment_size = Stack<E, F>::default_segment_size()):
-  ResourceStack(size_t segment_size): Stack<E, F>(segment_size, max_uintx)
-    { }
-
-  // Set the segment pointers to nullptr so the parent dtor does not free them;
-  // that must be done by the ResourceMark code.
-  ~ResourceStack() { Stack<E, F>::reset(true); }
-
-protected:
-  virtual E*   alloc(size_t bytes);
-  virtual void free(E* addr, size_t bytes);
-
-private:
-  void clear(bool clear_cache = false);
-};
-
 template <class E, MEMFLAGS F>
 class StackIterator: public StackObj
 {

src/hotspot/share/utilities/stack.inline.hpp

@@ -243,18 +243,6 @@ void Stack<E, F>::zap_segment(E* seg, bool zap_link_field) const
 }
 #endif
 
-template <class E, MEMFLAGS F>
-E* ResourceStack<E, F>::alloc(size_t bytes)
-{
-  return (E*) resource_allocate_bytes(bytes);
-}
-
-template <class E, MEMFLAGS F>
-void ResourceStack<E, F>::free(E* addr, size_t bytes)
-{
-  resource_free_bytes(Thread::current(), (char*) addr, bytes);
-}
-
 template <class E, MEMFLAGS F>
 void StackIterator<E, F>::sync()
 {