Reland of [counters] adding runtime call timers for GC

src/counters.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/counters.h"
 
 #include <iomanip>
 
 #include "src/base/platform/platform.h"
 #include "src/isolate.h"
@@ skipping 287 matching lines @@
 
 #define PRINT_COUNTER(name, nargs, ressize) entries.Add(&this->Runtime_##name);
   FOR_EACH_INTRINSIC(PRINT_COUNTER)
 #undef PRINT_COUNTER
 
 #define PRINT_COUNTER(name, type) entries.Add(&this->Builtin_##name);
   BUILTIN_LIST_C(PRINT_COUNTER)
 #undef PRINT_COUNTER
 
   entries.Add(&this->ExternalCallback);
+  entries.Add(&this->GC);
   entries.Add(&this->UnexpectedStubMiss);
 
   entries.Print(os);
 }
 
 void RuntimeCallStats::Reset() {
   if (!FLAG_runtime_call_stats) return;
 #define RESET_COUNTER(name, nargs, ressize) this->Runtime_##name.Reset();
   FOR_EACH_INTRINSIC(RESET_COUNTER)
 #undef RESET_COUNTER
 #define RESET_COUNTER(name, type) this->Builtin_##name.Reset();
   BUILTIN_LIST_C(RESET_COUNTER)
 #undef RESET_COUNTER
   this->ExternalCallback.Reset();
+  this->GC.Reset();
   this->UnexpectedStubMiss.Reset();
 }
 
 void RuntimeCallTimerScope::Enter(Isolate* isolate,
                                   RuntimeCallCounter* counter) {
   isolate_ = isolate;
   RuntimeCallStats* stats = isolate->counters()->runtime_call_stats();
   timer_.Initialize(counter, stats->current_timer());
   stats->Enter(&timer_);
 }
 
 void RuntimeCallTimerScope::Leave() {
   isolate_->counters()->runtime_call_stats()->Leave(&timer_);
 }
 
 }  // namespace internal
 }  // namespace v8