Code cleanup & simplification....

src/mark-compact.h

Index: src/mark-compact.h
===================================================================
--- src/mark-compact.h	(revision 687)
+++ src/mark-compact.h	(working copy)
@@ -152,9 +152,17 @@
   static void MarkUnmarkedObject(HeapObject* obj);
 
   static inline void MarkObject(HeapObject* obj) {
-     if (!obj->IsMarked()) MarkUnmarkedObject(obj);
+    if (!obj->IsMarked()) MarkUnmarkedObject(obj);
   }
 
+  static inline void SetMark(HeapObject* obj) {
+    tracer_->increment_marked_count();
+#ifdef DEBUG
+    UpdateLiveObjectCount(obj);
+#endif
+    obj->SetMark();
+  }
+
   // Creates back pointers for all map transitions, stores them in
   // the prototype field.  The original prototype pointers are restored
   // in ClearNonLiveTransitions().  All JSObject maps