Add delegating initialize method for RuntimeCallTimerScope.

BUG=v8:5089

Review-Url: https://codereview.chromium.org/2329053002
Cr-Commit-Position: refs/heads/master@{#39324}

src/counters-inl.h

@@ -14,9 +14,7 @@ RuntimeCallTimerScope::RuntimeCallTimerScope(
     Isolate* isolate, RuntimeCallStats::CounterId counter_id) {
   if (V8_UNLIKELY(TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_ENABLED() ||
                   FLAG_runtime_call_stats)) {
-    isolate_ = isolate;
-    RuntimeCallStats::Enter(isolate_->counters()->runtime_call_stats(), &timer_,
-                            counter_id);
+    Initialize(isolate, counter_id);
   }
 }
 
@@ -24,7 +22,7 @@ RuntimeCallTimerScope::RuntimeCallTimerScope(
     HeapObject* heap_object, RuntimeCallStats::CounterId counter_id) {
   if (V8_UNLIKELY(TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_ENABLED() ||
                   FLAG_runtime_call_stats)) {
-    RuntimeCallTimerScope(heap_object->GetIsolate(), counter_id);
+    Initialize(heap_object->GetIsolate(), counter_id);
   }
 }
 

src/counters.h

@@ -1257,6 +1257,13 @@ class RuntimeCallTimerScope {
   }
 
  private:
+  V8_INLINE void Initialize(Isolate* isolate,
+                            RuntimeCallStats::CounterId counter_id) {
+    isolate_ = isolate;
+    RuntimeCallStats::Enter(isolate_->counters()->runtime_call_stats(), &timer_,
+                            counter_id);
+  }
+
   Isolate* isolate_ = nullptr;
   RuntimeCallTimer timer_;
 };