[Tracing] Re-add trace-events used by metrics accidentally removed.

src/deoptimizer.cc

Index: src/deoptimizer.cc
diff --git a/src/deoptimizer.cc b/src/deoptimizer.cc
index e0d443d84c2da51125b57fe64f694b2e04dd0da6..93f5f97a1e03f5a3c86f22378929ea86c98983e4 100644
--- a/src/deoptimizer.cc
+++ b/src/deoptimizer.cc
@@ -361,6 +361,7 @@ void Deoptimizer::DeoptimizeAll(Isolate* isolate) {
   RuntimeCallTimerScope runtimeTimer(isolate,
                                      &RuntimeCallStats::DeoptimizeCode);
   TimerEventScope<TimerEventDeoptimizeCode> timer(isolate);
+  TRACE_EVENT0("v8", "V8.DeoptimizeCode");
   TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_SCOPED(
       isolate, &tracing::TraceEventStatsTable::DeoptimizeCode);
   if (FLAG_trace_deopt) {
@@ -383,6 +384,7 @@ void Deoptimizer::DeoptimizeMarkedCode(Isolate* isolate) {
   RuntimeCallTimerScope runtimeTimer(isolate,
                                      &RuntimeCallStats::DeoptimizeCode);
   TimerEventScope<TimerEventDeoptimizeCode> timer(isolate);
+  TRACE_EVENT0("v8", "V8.DeoptimizeCode");
   TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_SCOPED(
       isolate, &tracing::TraceEventStatsTable::DeoptimizeCode);
   if (FLAG_trace_deopt) {
@@ -417,6 +419,7 @@ void Deoptimizer::DeoptimizeFunction(JSFunction* function) {
   RuntimeCallTimerScope runtimeTimer(isolate,
                                      &RuntimeCallStats::DeoptimizeCode);
   TimerEventScope<TimerEventDeoptimizeCode> timer(isolate);
+  TRACE_EVENT0("v8", "V8.DeoptimizeCode");
   TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_SCOPED(
       isolate, &tracing::TraceEventStatsTable::DeoptimizeCode);
   Code* code = function->code();