[es6] Fix prototype chain walk for instanceof.

src/code-stub-assembler.cc

Index: src/code-stub-assembler.cc
diff --git a/src/code-stub-assembler.cc b/src/code-stub-assembler.cc
index cdd36b30d1e86ea2a200ec6856bcb9c94920040e..4f2d5ad8aea1e0dfed633f7b143bc036dd3e0f19 100644
--- a/src/code-stub-assembler.cc
+++ b/src/code-stub-assembler.cc
@@ -1956,8 +1956,8 @@ Node* CodeStubAssembler::OrdinaryHasInstance(Node* context, Node* callable,
 
     // Check the current {object} prototype.
     Node* object_prototype = LoadMapPrototype(object_map);
-    GotoIf(WordEqual(object_prototype, callable_prototype), &return_true);
     GotoIf(WordEqual(object_prototype, NullConstant()), &return_false);
+    GotoIf(WordEqual(object_prototype, callable_prototype), &return_true);
 
     // Continue with the prototype.
     var_object_map.Bind(LoadMap(object_prototype));