[heap] Account mark-compact prologue and epilogue in GC tracer.

src/heap/heap.cc

 // Copyright 2012 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/heap.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/ast/context-slot-cache.h"
 #include "src/base/bits.h"
@@ skipping 1429 matching lines @@
 
   MarkCompactEpilogue();
 
   if (FLAG_allocation_site_pretenuring) {
     EvaluateOldSpaceLocalPretenuring(size_of_objects_before_gc);
   }
 }
 
 
 void Heap::MarkCompactEpilogue() {
+  TRACE_GC(tracer(), GCTracer::Scope::MC_EPILOGUE);
   gc_state_ = NOT_IN_GC;
 
   isolate_->counters()->objs_since_last_full()->Set(0);
 
   incremental_marking()->Epilogue();
 
   PreprocessStackTraces();
   DCHECK(incremental_marking()->IsStopped());
 
   // We finished a marking cycle. We can uncommit the marking deque until
   // we start marking again.
   mark_compact_collector()->marking_deque()->Uninitialize();
   mark_compact_collector()->EnsureMarkingDequeIsCommitted(
       MarkCompactCollector::kMinMarkingDequeSize);
 }
 
 
 void Heap::MarkCompactPrologue() {
+  TRACE_GC(tracer(), GCTracer::Scope::MC_PROLOGUE);
   isolate_->context_slot_cache()->Clear();
   isolate_->descriptor_lookup_cache()->Clear();
   RegExpResultsCache::Clear(string_split_cache());
   RegExpResultsCache::Clear(regexp_multiple_cache());
 
   isolate_->compilation_cache()->MarkCompactPrologue();
 
   CompletelyClearInstanceofCache();
 
   FlushNumberStringCache();
@@ skipping 5020 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8