Remove special "store global proxy" IC, use as slow_stub().

src/builtins.h

Index: src/builtins.h
diff --git a/src/builtins.h b/src/builtins.h
index f76ed0223b0e4ea4f01644545b74858908bc196f..edc13f7511a2f18c08e096aa3c96ae9f76461813 100644
--- a/src/builtins.h
+++ b/src/builtins.h
@@ -157,16 +157,12 @@ enum BuiltinExtraArguments {
                                     kNoExtraICState)                    \
   V(StoreIC_Generic_Strict,         STORE_IC, GENERIC,                  \
                                     StoreIC::kStrictModeState)          \
-  V(StoreIC_GlobalProxy,            STORE_IC, GENERIC,                  \
-                                    kNoExtraICState)                    \
   V(StoreIC_Initialize_Strict,      STORE_IC, UNINITIALIZED,            \
                                     StoreIC::kStrictModeState)          \
   V(StoreIC_PreMonomorphic_Strict,  STORE_IC, PREMONOMORPHIC,           \
                                     StoreIC::kStrictModeState)          \
   V(StoreIC_Megamorphic_Strict,     STORE_IC, MEGAMORPHIC,              \
                                     StoreIC::kStrictModeState)          \
-  V(StoreIC_GlobalProxy_Strict,     STORE_IC, GENERIC,                  \
-                                    StoreIC::kStrictModeState)          \
   V(StoreIC_Setter_ForDeopt,        STORE_IC, MONOMORPHIC,              \
                                     StoreIC::kStrictModeState)          \
                                                                         \