8329659: Serial: Extract allowed_dead_ratio from ContiguousSpace

Reviewed-by: ayang, iwalulya

src/hotspot/share/gc/serial/serialFullGC.cpp

@@ -97,7 +97,8 @@ class DeadSpacer : StackObj {
 
 public:
   DeadSpacer(ContiguousSpace* space) : _allowed_deadspace_words(0), _space(space) {
-    size_t ratio = _space->allowed_dead_ratio();
+    size_t ratio = (_space == SerialHeap::heap()->old_gen()->space())
+                   ? MarkSweepDeadRatio : 0;
     _active = ratio > 0;
 
     if (_active) {

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

@@ -213,8 +213,4 @@ TenuredSpace::TenuredSpace(SerialBlockOffsetTable* offsets,
 {
   initialize(mr, SpaceDecorator::Clear, SpaceDecorator::Mangle);
 }
-
-size_t TenuredSpace::allowed_dead_ratio() const {
-  return MarkSweepDeadRatio;
-}
 #endif // INCLUDE_SERIALGC

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

@@ -135,10 +135,6 @@ public:
     _next_compaction_space = csp;
   }
 
-  // The maximum percentage of objects that can be dead in the compacted
-  // live part of a compacted space ("deadwood" support.)
-  virtual size_t allowed_dead_ratio() const { return 0; };
-
   // Accessors
   HeapWord* top() const            { return _top;    }
   void set_top(HeapWord* value)    { _top = value; }
@@ -196,8 +192,6 @@ class TenuredSpace: public ContiguousSpace {
  protected:
   SerialBlockOffsetTable* _offsets;
 
-  // Mark sweep support
-  size_t allowed_dead_ratio() const override;
  public:
   // Constructor
   TenuredSpace(SerialBlockOffsetTable* offsets,