8324769: Serial: Remove unused TenuredGeneration::unsafe_max_alloc_nogc

Reviewed-by: tschatzl

src/hotspot/share/gc/serial/defNewGeneration.hpp

@@ -174,7 +174,14 @@ class DefNewGeneration: public Generation {
   size_t free() const;
   size_t max_capacity() const;
   size_t capacity_before_gc() const;
+
+  // Return an estimate of the maximum allocation that could be performed
+  // in the generation without triggering any collection or expansion
+  // activity.  It is "unsafe" because no locks are taken; the result
+  // should be treated as an approximation, not a guarantee, for use in
+  // heuristic resizing decisions.
   size_t unsafe_max_alloc_nogc() const;
+
   size_t contiguous_available() const;
 
   size_t max_eden_size() const              { return _max_eden_size; }

src/hotspot/share/gc/serial/generation.hpp

@@ -108,13 +108,6 @@ class Generation: public CHeapObj<mtGC> {
   // The largest number of contiguous free bytes in this or any higher generation.
   virtual size_t max_contiguous_available() const;
 
-  // Return an estimate of the maximum allocation that could be performed
-  // in the generation without triggering any collection or expansion
-  // activity.  It is "unsafe" because no locks are taken; the result
-  // should be treated as an approximation, not a guarantee, for use in
-  // heuristic resizing decisions.
-  virtual size_t unsafe_max_alloc_nogc() const = 0;
-
   // Returns true if this generation cannot be expanded further
   // without a GC. Override as appropriate.
   virtual bool is_maximal_no_gc() const {

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

@@ -450,10 +450,6 @@ TenuredGeneration::expand_and_allocate(size_t word_size, bool is_tlab) {
   return _the_space->allocate(word_size);
 }
 
-size_t TenuredGeneration::unsafe_max_alloc_nogc() const {
-  return _the_space->free();
-}
-
 size_t TenuredGeneration::contiguous_available() const {
   return _the_space->free() + _virtual_space.uncommitted_size();
 }

src/hotspot/share/gc/serial/tenuredGeneration.hpp

@@ -111,7 +111,6 @@ class TenuredGeneration: public Generation {
   const char* name() const { return "tenured generation"; }
   const char* short_name() const { return "Tenured"; }
 
-  size_t unsafe_max_alloc_nogc() const;
   size_t contiguous_available() const;
 
   // Iteration