Use preallocated StackOverflowException

runtime/vm/object_store.h

Index: runtime/vm/object_store.h
===================================================================
--- runtime/vm/object_store.h	(revision 2103)
+++ runtime/vm/object_store.h	(working copy)
@@ -279,6 +279,11 @@
     empty_context_ = value.raw();
   }
 
+  RawInstance* stack_overflow() const { return stack_overflow_; }
+  void set_stack_overflow(const Instance& value) {
+    stack_overflow_ = value.raw();
+  }
+
   // Visit all object pointers.
   void VisitObjectPointers(ObjectPointerVisitor* visitor);
 
@@ -287,6 +292,11 @@
   RawType* GetType(int index);
   int GetTypeIndex(const RawType* raw_type);
 
+  // Called to initialize objects required by the vm but which invoke
+  // dart code.  If an error occurs then false is returned and error
+  // information is stored in sticky_error().
+  bool PreallocateObjects();
+
   static void Init(Isolate* isolate);
 
  private:
@@ -334,8 +344,11 @@
   RawArray* pending_classes_;
   RawString* sticky_error_;
   RawContext* empty_context_;
-  RawObject** to() { return reinterpret_cast<RawObject**>(&empty_context_); }
+  RawInstance* stack_overflow_;
+  RawObject** to() { return reinterpret_cast<RawObject**>(&stack_overflow_); }
 
+  bool preallocate_objects_called_;
+
   friend class SnapshotReader;
 
   DISALLOW_COPY_AND_ASSIGN(ObjectStore);