8331715: Remove virtual specifiers in ContiguousSpace

Reviewed-by: gli, tschatzl

src/hotspot/share/gc/shared/space.hpp

@@ -73,8 +73,11 @@ public:
   // Accessors
   HeapWord* bottom() const         { return _bottom; }
   HeapWord* end() const            { return _end;    }
+  HeapWord* top() const            { return _top;    }
+
   void set_bottom(HeapWord* value) { _bottom = value; }
   void set_end(HeapWord* value)    { _end = value; }
+  void set_top(HeapWord* value)    { _top = value; }
 
   // Testers
   bool is_empty() const              { return used() == 0; }
@@ -112,10 +115,6 @@ public:
   // had allocation performed in it, but is now to be considered empty.
   void clear(bool mangle_space);
 
-  // Accessors
-  HeapWord* top() const            { return _top;    }
-  void set_top(HeapWord* value)    { _top = value; }
-
   // Used to save the space's current top for later use during mangling.
   void set_top_for_allocations() PRODUCT_RETURN;
 
@@ -139,9 +138,9 @@ public:
 
   // Allocation (return null if full).  Assumes the caller has established
   // mutually exclusive access to the space.
-  virtual HeapWord* allocate(size_t word_size);
+  HeapWord* allocate(size_t word_size);
   // Allocation (return null if full).  Enforces mutual exclusion internally.
-  virtual HeapWord* par_allocate(size_t word_size);
+  HeapWord* par_allocate(size_t word_size);
 
   // Iteration
   void object_iterate(ObjectClosure* blk);