[heap] Add timer scopes to process weak cells and clear non-live references.

src/heap/gc-tracer.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/heap/gc-tracer.h"
 
 #include "src/counters.h"
 #include "src/heap/heap-inl.h"
 #include "src/isolate.h"
 
@@ skipping 432 matching lines @@
              current_.scopes[Scope::MC_UPDATE_MISC_POINTERS]);
       PrintF("weak_closure=%.1f ", current_.scopes[Scope::MC_WEAKCLOSURE]);
       PrintF("inc_weak_closure=%.1f ",
              current_.scopes[Scope::MC_INCREMENTAL_WEAKCLOSURE]);
       PrintF("weakcollection_process=%.1f ",
              current_.scopes[Scope::MC_WEAKCOLLECTION_PROCESS]);
       PrintF("weakcollection_clear=%.1f ",
              current_.scopes[Scope::MC_WEAKCOLLECTION_CLEAR]);
       PrintF("weakcollection_abort=%.1f ",
              current_.scopes[Scope::MC_WEAKCOLLECTION_ABORT]);
+      PrintF("weakcells=%.1f ", current_.scopes[Scope::MC_WEAKCELL]);
+      PrintF("nonlive_refs=%.1f ",
+             current_.scopes[Scope::MC_NONLIVEREFERENCES]);
 
       PrintF("steps_count=%d ", current_.incremental_marking_steps);
       PrintF("steps_took=%.1f ", current_.incremental_marking_duration);
       PrintF("longest_step=%.1f ", current_.longest_incremental_marking_step);
       PrintF("incremental_marking_throughput=%" V8_PTR_PREFIX "d ",
              IncrementalMarkingSpeedInBytesPerMillisecond());
       break;
     case Event::START:
       break;
     default:
@@ skipping 282 matching lines @@
 
 
 bool GCTracer::SurvivalEventsRecorded() const {
   return survival_events_.size() > 0;
 }
 
 
 void GCTracer::ResetSurvivalEvents() { survival_events_.reset(); }
 }  // namespace internal
 }  // namespace v8