[counters] Making counter properly reentrant.

src/builtins.cc

Index: src/builtins.cc
diff --git a/src/builtins.cc b/src/builtins.cc
index c0a0ef7fe2ac792e16ee99dd71607a46a5fccba9..3a17b905015a0fdff55b41b66b839db14c2170b9 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -143,16 +143,14 @@ BUILTIN_LIST_C(DEF_ARG_TYPE)
   MUST_USE_RESULT static Object* Builtin_##name(                               \
       int args_length, Object** args_object, Isolate* isolate) {               \
     isolate->counters()->runtime_calls()->Increment();                         \
-    base::ElapsedTimer timer;                                                  \
     if (FLAG_runtime_call_stats) {                                             \
       RuntimeCallStats* stats = isolate->counters()->runtime_call_stats();     \
       stats->Enter(&stats->Builtin_##name);                                    \
-      timer.Start();                                                           \
     }                                                                          \
     name##ArgumentsType args(args_length, args_object);                        \
     Object* value = Builtin_Impl_##name(args, isolate);                        \
     if (FLAG_runtime_call_stats) {                                             \
-      isolate->counters()->runtime_call_stats()->Leave(timer.Elapsed());       \
+      isolate->counters()->runtime_call_stats()->Leave();                      \
     }                                                                          \
     return value;                                                              \
   }                                                                            \