Remove a bunch of Isolate::UncheckedCurrent calls

src/counters.h

Index: src/counters.h
diff --git a/src/counters.h b/src/counters.h
index 540bcbdadbf48999400879c74d3f1746cc9945db..93079b1ef9bdc2b287421519ea7d25e2b899ff0b 100644
--- a/src/counters.h
+++ b/src/counters.h
@@ -143,6 +143,9 @@ class StatsCounter {
     return loc;
   }
 
+  // Reset the cached internal pointer.
+  void Reset() { lookup_done_ = false; }
+
  protected:
   // Returns the cached address of this counter location.
   int* GetPtr() {
@@ -629,6 +632,7 @@ class Counters {
     stats_counter_count
   };
 
+  void ResetCounters();
   void ResetHistograms();
 
  private: