Toward precompiled snapshots.

runtime/vm/object.h

Index: runtime/vm/object.h
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index e80096bf7c672561fba3b0899872696377348a1e..3d9dade30ae05597ee0867cd271f48ab516d7b8c 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -482,6 +482,12 @@ class Object {
     return *vm_isolate_snapshot_object_table_;
   }
   static void InitVmIsolateSnapshotObjectTable(intptr_t len);
+  static const uint8_t* instructions_snapshot_buffer() {
+    return instructions_snapshot_buffer_;
+  }
+  static void set_instructions_snapshot_buffer(const uint8_t* buffer) {
+    instructions_snapshot_buffer_ = buffer;
+  }
 
   static RawClass* class_class() { return class_class_; }
   static RawClass* dynamic_class() { return dynamic_class_; }
@@ -806,6 +812,7 @@ class Object {
   static LanguageError* snapshot_writer_error_;
   static LanguageError* branch_offset_error_;
   static Array* vm_isolate_snapshot_object_table_;
+  static const uint8_t* instructions_snapshot_buffer_;
 
   friend void ClassTable::Register(const Class& cls);
   friend void RawObject::Validate(Isolate* isolate) const;