8295012: Arena should not derive from CHeapObj<mtNone>

Reviewed-by: stefank, dholmes

src/hotspot/share/memory/arena.cpp

@@ -271,29 +271,6 @@ Arena::~Arena() {
   MemTracker::record_arena_free(_flags);
 }
 
-void* Arena::operator new(size_t size) throw() {
-  assert(false, "Use dynamic memory type binding");
-  return NULL;
-}
-
-void* Arena::operator new (size_t size, const std::nothrow_t&  nothrow_constant) throw() {
-  assert(false, "Use dynamic memory type binding");
-  return NULL;
-}
-
-  // dynamic memory type binding
-void* Arena::operator new(size_t size, MEMFLAGS flags) throw() {
-  return (void *) AllocateHeap(size, flags, CALLER_PC);
-}
-
-void* Arena::operator new(size_t size, const std::nothrow_t& nothrow_constant, MEMFLAGS flags) throw() {
-  return (void*)AllocateHeap(size, flags, CALLER_PC, AllocFailStrategy::RETURN_NULL);
-}
-
-void Arena::operator delete(void* p) {
-  FreeHeap(p);
-}
-
 // Destroy this arenas contents and reset to empty
 void Arena::destruct_contents() {
   if (UseMallocOnly && _first != NULL) {

src/hotspot/share/memory/arena.hpp

@@ -86,7 +86,7 @@ class Chunk: CHeapObj<mtChunk> {
 
 //------------------------------Arena------------------------------------------
 // Fast allocation of memory
-class Arena : public CHeapObj<mtNone> {
+class Arena : public CHeapObjBase {
 protected:
   friend class HandleMark;
   friend class NoHandleMark;
@@ -121,15 +121,6 @@ protected:
   void  destruct_contents();
   char* hwm() const             { return _hwm; }
 
-  // new operators
-  void* operator new (size_t size) throw();
-  void* operator new (size_t size, const std::nothrow_t& nothrow_constant) throw();
-
-  // dynamic memory type tagging
-  void* operator new(size_t size, MEMFLAGS flags) throw();
-  void* operator new(size_t size, const std::nothrow_t& nothrow_constant, MEMFLAGS flags) throw();
-  void  operator delete(void* p);
-
   // Fast allocate in the arena.  Common case aligns to the size of jlong which is 64 bits
   // on both 32 and 64 bit platforms. Required for atomic jlong operations on 32 bits.
   void* Amalloc(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {