VM-internalize the default Map implementation.

runtime/vm/raw_object.h

Index: runtime/vm/raw_object.h
diff --git a/runtime/vm/raw_object.h b/runtime/vm/raw_object.h
index 217f30f4bf54851e7e75a45ce60e0de3add2c71d..61fd88135fe15e18ebfdf8b428f1b026da2ceac8 100644
--- a/runtime/vm/raw_object.h
+++ b/runtime/vm/raw_object.h
@@ -1689,11 +1689,15 @@ class RawLinkedHashMap : public RawInstance {
     return reinterpret_cast<RawObject**>(&ptr()->type_arguments_);
   }
   RawTypeArguments* type_arguments_;
-  RawInstance* cme_mark_;
   RawArray* data_;
+  RawTypedData* index_;
   RawObject** to() {
-    return reinterpret_cast<RawObject**>(&ptr()->data_);
+    return reinterpret_cast<RawObject**>(&ptr()->index_);
   }
+  // No heap object pointers after index_.
+  RawSmi* hash_mask_;
+  RawSmi* used_data_;
+  RawSmi* deleted_keys_;

[siva, 2015/05/22 16:27:11]

We have always put the RawSmi* fields also inside the from/to block and treated
them like regular heap objects in this file. This seems inconsistent with that.

[koda, 2015/05/26 12:22:04]

Done.

 
   friend class SnapshotReader;
 };