Replace ICStub for array.length with hydrogen stub

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 47fd69d7ccc2c20140c5d181079eeec86257ebf2..5df2730c2f36bca1ab1e9a8c2977ec65caeeda31 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -921,6 +921,9 @@ class HGraphBuilder {
       bool is_store,
       Representation checked_index_representation = Representation::None());
 
+  HInstruction* BuildFastArrayLengthLoad(
+      HValue* object);
+
   HInstruction* BuildStoreMap(HValue* object, HValue* map, BailoutId id);
   HInstruction* BuildStoreMap(HValue* object, Handle<Map> map, BailoutId id);