Prototype of mark-and-compact support for Harmony weak maps.

src/objects-visiting.cc

Index: src/objects-visiting.cc
diff --git a/src/objects-visiting.cc b/src/objects-visiting.cc
index ae56dad59b15e6ed61ef5a433a4796b2a0231dd7..84ab57f53c45248a907d270a22b07847263eb6a8 100644
--- a/src/objects-visiting.cc
+++ b/src/objects-visiting.cc
@@ -88,6 +88,9 @@ StaticVisitorBase::VisitorId StaticVisitorBase::GetVisitorId(
     case JS_GLOBAL_PROPERTY_CELL_TYPE:
       return kVisitPropertyCell;
 
+    case JS_WEAK_MAP_TYPE:
+      return kVisitJSWeakMap;
+
     case JS_REGEXP_TYPE:
       return kVisitJSRegExp;
 
@@ -115,7 +118,6 @@ StaticVisitorBase::VisitorId StaticVisitorBase::GetVisitorId(
     case JS_GLOBAL_OBJECT_TYPE:
     case JS_BUILTINS_OBJECT_TYPE:
     case JS_MESSAGE_OBJECT_TYPE:
-    case JS_WEAK_MAP_TYPE:
       return GetVisitorIdForSize(kVisitJSObject,
                                  kVisitJSObjectGeneric,
                                  instance_size);