Add MEGAMORPHIC state support for KeyedLoadIC

src/builtins.cc

Index: src/builtins.cc
diff --git a/src/builtins.cc b/src/builtins.cc
index 0f1baa1f0ad9e9be539e000b44fde8feb13174cf..3e0e1ba6dc1995d004bd7d7dd14939a4981589aa 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -1273,8 +1273,8 @@ static void Generate_KeyedLoadIC_Miss(MacroAssembler* masm) {
 }
 
 
-static void Generate_KeyedLoadIC_Generic(MacroAssembler* masm) {
-  KeyedLoadIC::GenerateGeneric(masm);
+static void Generate_KeyedLoadIC_Megamorphic(MacroAssembler* masm) {
+  KeyedLoadIC::GenerateMegamorphic(masm);
 }