[builtins] Also simplify the Symbol constructor.

src/builtins.h

Index: src/builtins.h
diff --git a/src/builtins.h b/src/builtins.h
index aff47f259366291534af191a01063c2caeeb0f29..f2b6b1e5d1f50b1a117c37331260b90eb9209e4a 100644
--- a/src/builtins.h
+++ b/src/builtins.h
@@ -59,6 +59,9 @@ enum BuiltinExtraArguments {
                                                              \
   V(DateToPrimitive, NO_EXTRA_ARGUMENTS)                     \
                                                              \
+  V(SymbolConstructor, NO_EXTRA_ARGUMENTS)                   \
+  V(SymbolConstructor_ConstructStub, NO_EXTRA_ARGUMENTS)     \
+                                                             \
   V(HandleApiCall, NEEDS_CALLED_FUNCTION)                    \
   V(HandleApiCallConstruct, NEEDS_CALLED_FUNCTION)           \
   V(HandleApiCallAsFunction, NO_EXTRA_ARGUMENTS)             \