- Canonicalize types, type_arguments only when the object is marked as being from the core librarie…

runtime/vm/heap.h

Index: runtime/vm/heap.h
===================================================================
--- runtime/vm/heap.h	(revision 20419)
+++ runtime/vm/heap.h	(working copy)
@@ -132,7 +132,10 @@
 
   // Enables growth control on the page space heaps.  This should be
   // called before any user code is executed.
-  void EnableGrowthControl();
+  void EnableGrowthControl() { SetGrowthControlState(true); }
+  void DisableGrowthControl() { SetGrowthControlState(false); }
+  void SetGrowthControlState(bool state);
+  bool GrowthControlState();
 
   // Protect access to the heap.
   void WriteProtect(bool read_only);
@@ -274,6 +277,16 @@
 };
 #endif  // defined(DEBUG)
 
+
+class NoHeapGrowthControlScope : public StackResource {
+ public:
+  NoHeapGrowthControlScope();
+  ~NoHeapGrowthControlScope();
+ private:
+  bool current_growth_controller_state_;
+  DISALLOW_COPY_AND_ASSIGN(NoHeapGrowthControlScope);
+};
+
 }  // namespace dart
 
 #endif  // VM_HEAP_H_