8242213: Shenandoah: remove ShenandoahHeuristics::_bytes_in_cset

Reviewed-by: rkennke

src/hotspot/share/gc/shenandoah/heuristics/shenandoahAdaptiveHeuristics.cpp

@@ -76,7 +76,6 @@ void ShenandoahAdaptiveHeuristics::choose_collection_set_from_regiondata(Shenand
 
   size_t cur_cset = 0;
   size_t cur_garbage = 0;
-  _bytes_in_cset = 0;
 
   for (size_t idx = 0; idx < size; idx++) {
     ShenandoahHeapRegion* r = data[idx]._region;
@@ -90,7 +89,6 @@ void ShenandoahAdaptiveHeuristics::choose_collection_set_from_regiondata(Shenand
 
     if ((new_garbage < min_garbage) || (r->garbage() > garbage_threshold)) {
       cset->add_region(r);
-      _bytes_in_cset += r->used();
       cur_cset = new_cset;
       cur_garbage = new_garbage;
     }

src/hotspot/share/gc/shenandoah/shenandoahHeuristics.cpp

@@ -46,7 +46,6 @@ ShenandoahHeuristics::ShenandoahHeuristics() :
   _region_data(NULL),
   _degenerated_cycles_in_a_row(0),
   _successful_cycles_in_a_row(0),
-  _bytes_in_cset(0),
   _cycle_start(os::elapsedTime()),
   _last_cycle_end(0),
   _gc_times_learned(0),
@@ -258,12 +257,10 @@ void ShenandoahHeuristics::record_success_full() {
 }
 
 void ShenandoahHeuristics::record_allocation_failure_gc() {
-  _bytes_in_cset = 0;
+  // Do nothing.
 }
 
 void ShenandoahHeuristics::record_requested_gc() {
-  _bytes_in_cset = 0;
-
   // Assume users call System.gc() when external state changes significantly,
   // which forces us to re-learn the GC timings and allocation rates.
   _gc_times_learned = 0;

src/hotspot/share/gc/shenandoah/shenandoahHeuristics.hpp

@@ -82,8 +82,6 @@ class ShenandoahHeuristics : public CHeapObj<mtGC> {
   uint _degenerated_cycles_in_a_row;
   uint _successful_cycles_in_a_row;
 
-  size_t _bytes_in_cset;
-
   double _cycle_start;
   double _last_cycle_end;