GC: Add tracing event for rescanning large objects on newspace evacuation

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/v8.h"
 
 #include "src/heap/gc-tracer.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 408 matching lines @@
     case Event::MARK_COMPACTOR:
     case Event::INCREMENTAL_MARK_COMPACTOR:
       PrintF("external=%.1f ", current_.scopes[Scope::EXTERNAL]);
       PrintF("mark=%.1f ", current_.scopes[Scope::MC_MARK]);
       PrintF("sweep=%.2f ", current_.scopes[Scope::MC_SWEEP]);
       PrintF("sweepns=%.2f ", current_.scopes[Scope::MC_SWEEP_NEWSPACE]);
       PrintF("sweepos=%.2f ", current_.scopes[Scope::MC_SWEEP_OLDSPACE]);
       PrintF("sweepcode=%.2f ", current_.scopes[Scope::MC_SWEEP_CODE]);
       PrintF("sweepcell=%.2f ", current_.scopes[Scope::MC_SWEEP_CELL]);
       PrintF("sweepmap=%.2f ", current_.scopes[Scope::MC_SWEEP_MAP]);
+      PrintF("rescan_lo=%.2f ",
+             current_.scopes[Scope::MC_RESCAN_LARGE_OBJECTS]);
       PrintF("evacuate=%.1f ", current_.scopes[Scope::MC_EVACUATE_PAGES]);
       PrintF("new_new=%.1f ",
              current_.scopes[Scope::MC_UPDATE_NEW_TO_NEW_POINTERS]);
       PrintF("root_new=%.1f ",
              current_.scopes[Scope::MC_UPDATE_ROOT_TO_NEW_POINTERS]);
       PrintF("old_new=%.1f ",
              current_.scopes[Scope::MC_UPDATE_OLD_TO_NEW_POINTERS]);
       PrintF("compaction_ptrs=%.1f ",
              current_.scopes[Scope::MC_UPDATE_POINTERS_TO_EVACUATED]);
       PrintF("intracompaction_ptrs=%.1f ",
@@ skipping 300 matching lines @@
 
 
 bool GCTracer::SurvivalEventsRecorded() const {
   return survival_events_.size() > 0;
 }
 
 
 void GCTracer::ResetSurvivalEvents() { survival_events_.reset(); }
 }  // namespace internal
 }  // namespace v8