Add LoadIC_Slow builtin and use it for loading properties from primitive values.

src/builtins.h

Index: src/builtins.h
diff --git a/src/builtins.h b/src/builtins.h
index 58d1a8b147963ca79ff86a87059f332d049e80dc..c45fbfd335da1a2a6c80f2c2568db44f9c079106 100644
--- a/src/builtins.h
+++ b/src/builtins.h
@@ -144,6 +144,8 @@ enum BuiltinExtraArguments {
                                     Code::kNoExtraICState)              \
   V(LoadIC_Getter_ForDeopt,         LOAD_IC, MONOMORPHIC,               \
                                     Code::kNoExtraICState)              \
+  V(LoadIC_Slow,                    LOAD_IC, GENERIC,                   \
+                                    Code::kNoExtraICState)              \
                                                                         \
   V(KeyedLoadIC_Initialize,         KEYED_LOAD_IC, UNINITIALIZED,       \
                                     Code::kNoExtraICState)              \