Sped up hashCode by removing megamorphic call to _identityHashCode.

runtime/vm/object_store.h

Index: runtime/vm/object_store.h
diff --git a/runtime/vm/object_store.h b/runtime/vm/object_store.h
index 54b7044b1a5036b9a534fa22b5157f600742249a..e5c1f7666f07ebaccca310a6ff06e8cd98505b9d 100644
--- a/runtime/vm/object_store.h
+++ b/runtime/vm/object_store.h
@@ -479,6 +479,16 @@ class ObjectStore {
     megamorphic_miss_function_ = func.raw();
   }
 
+  RawFunction* simple_instance_of_function() const {
+    return simple_instance_of_function_;
+  }
+  RawFunction* simple_instance_of_true_function() const {
+    return simple_instance_of_true_function_;
+  }
+  RawFunction* simple_instance_of_false_function() const {
+    return simple_instance_of_false_function_;
+  }
+
   // Visit all object pointers.
   void VisitObjectPointers(ObjectPointerVisitor* visitor);
 
@@ -496,6 +506,9 @@ class ObjectStore {
  private:
   ObjectStore();
 
+  // Finds a core library private method in Object.
+  RawFunction* PrivateObjectLookup(const String& name);
+
 #define OBJECT_STORE_FIELD_LIST(V)                                             \
   V(RawClass*, object_class_)                                                  \
   V(RawType*, object_type_)                                                    \
@@ -572,12 +585,17 @@ class ObjectStore {
   V(RawTypedData*, empty_uint32_array_)                                        \
   V(RawFunction*, handle_message_function_)                                    \
   V(RawArray*, library_load_error_table_)                                      \
+  V(RawFunction*, simple_instance_of_function_)                                \
+  V(RawFunction*, simple_instance_of_true_function_)                           \
+  V(RawFunction*, simple_instance_of_false_function_)                          \
+  V(RawArray*, compile_time_constants_)                                        \
   V(RawArray*, unique_dynamic_targets_)                                        \
   V(RawGrowableObjectArray*, token_objects_)                                   \
   V(RawArray*, token_objects_map_)                                             \
   V(RawGrowableObjectArray*, megamorphic_cache_table_)                         \
   V(RawCode*, megamorphic_miss_code_)                                          \
   V(RawFunction*, megamorphic_miss_function_)                                  \
+  // Please remember the last entry must be referred in the 'to' function below.
 
   RawObject** from() { return reinterpret_cast<RawObject**>(&object_class_); }
 #define DECLARE_OBJECT_STORE_FIELD(type, name)                                 \