Made iteration of global handles more efficient on scavenges.

src/global-handles.h

Index: src/global-handles.h
diff --git a/src/global-handles.h b/src/global-handles.h
index 87eb9b83017110a2dec434f90ee6f33f4263586f..8ee4ecbee2c93a570c307ea3dd75f86217a28c7a 100644
--- a/src/global-handles.h
+++ b/src/global-handles.h
@@ -95,8 +95,11 @@ class GlobalHandles : public AllStatic {
   // Process pending weak handles.
   static void PostGarbageCollectionProcessing();
 
+  // Iterates over all strong handles.
+  static void IterateStrongRoots(ObjectVisitor* v);
+
   // Iterates over all handles.
-  static void IterateRoots(ObjectVisitor* v);
+  static void IterateAllRoots(ObjectVisitor* v);
 
   // Iterates over all weak roots in heap.
   static void IterateWeakRoots(ObjectVisitor* v);