Replace store array length builtin with codestub.

src/builtins.cc

Index: src/builtins.cc
diff --git a/src/builtins.cc b/src/builtins.cc
index 72477c04634ae734396284f0b9bcd017ed9991df..16e672c16f6f7e2f25131de106e28d609b484aca 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -1560,16 +1560,6 @@ static void Generate_StoreIC_Megamorphic_Strict(MacroAssembler* masm) {
 }
 
 
-static void Generate_StoreIC_ArrayLength(MacroAssembler* masm) {
-  StoreIC::GenerateArrayLength(masm);
-}
-
-
-static void Generate_StoreIC_ArrayLength_Strict(MacroAssembler* masm) {
-  StoreIC::GenerateArrayLength(masm);
-}
-
-
 static void Generate_StoreIC_GlobalProxy(MacroAssembler* masm) {
   StoreIC::GenerateGlobalProxy(masm, kNonStrictMode);
 }