Moves the top_ and end_ words of the Scavenger into mutator thread.

runtime/vm/heap.cc

Index: runtime/vm/heap.cc
diff --git a/runtime/vm/heap.cc b/runtime/vm/heap.cc
index 4998b881cfdc1c4876e1cbf79b991a4853aaa9c1..303ae756abb392c2df67f3f6a5a9b70ea7c04580 100644
--- a/runtime/vm/heap.cc
+++ b/runtime/vm/heap.cc
@@ -499,16 +499,6 @@ intptr_t Heap::TopOffset(Heap::Space space) {
 }
 
 
-intptr_t Heap::EndOffset(Heap::Space space) {
-  if (space == kNew) {
-    return OFFSET_OF(Heap, new_space_) + Scavenger::end_offset();
-  } else {
-    ASSERT(space == kOld);
-    return OFFSET_OF(Heap, old_space_) + PageSpace::end_offset();
-  }
-}
-
-
 void Heap::Init(Isolate* isolate,
                 intptr_t max_new_gen_words,
                 intptr_t max_old_gen_words,