[counters] adding runtime call timers for GC

src/counters.cc

Index: src/counters.cc
diff --git a/src/counters.cc b/src/counters.cc
index 60c800605ca7da570e053fa99791e8c513d7602d..4f5c251a0cce8a42f5f33e057c4032f493b365cc 100644
--- a/src/counters.cc
+++ b/src/counters.cc
@@ -305,6 +305,7 @@ void RuntimeCallStats::Print(std::ostream& os) {
 #undef PRINT_COUNTER
 
   entries.Add(&this->ExternalCallback);
+  entries.Add(&this->GC);
   entries.Add(&this->UnexpectedStubMiss);
 
   entries.Print(os);
@@ -319,6 +320,7 @@ void RuntimeCallStats::Reset() {
   BUILTIN_LIST_C(RESET_COUNTER)
 #undef RESET_COUNTER
   this->ExternalCallback.Reset();
+  this->GC.Reset();
   this->UnexpectedStubMiss.Reset();
 }