Replace ICStub for array.length with hydrogen stub

src/ast.h

Index: src/ast.h
diff --git a/src/ast.h b/src/ast.h
index 5debc74ebbab68ee18c40a863d664ad5f92e7a1b..75a08aceb3ee5a0a91ec4c2217355ecf475f9498 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -1481,7 +1481,6 @@ class Property: public Expression {
   void RecordTypeFeedback(TypeFeedbackOracle* oracle, Zone* zone);
   virtual bool IsMonomorphic() { return is_monomorphic_; }
   virtual SmallMapList* GetReceiverTypes() { return &receiver_types_; }
-  bool IsArrayLength() { return is_array_length_; }
   bool IsUninitialized() { return is_uninitialized_; }
   TypeFeedbackId PropertyFeedbackId() { return reuse(id()); }
 
@@ -1497,7 +1496,6 @@ class Property: public Expression {
         load_id_(GetNextId(isolate)),
         is_monomorphic_(false),
         is_uninitialized_(false),
-        is_array_length_(false),
         is_string_length_(false),
         is_string_access_(false),
         is_function_prototype_(false) { }
@@ -1511,7 +1509,6 @@ class Property: public Expression {
   SmallMapList receiver_types_;
   bool is_monomorphic_ : 1;
   bool is_uninitialized_ : 1;
-  bool is_array_length_ : 1;
   bool is_string_length_ : 1;
   bool is_string_access_ : 1;
   bool is_function_prototype_ : 1;