Added NewDriverOnlyOption to the new flag

Author: Sam Pyankov

include/swift/Option/Options.td

@@ -2354,6 +2354,7 @@ def cache_replay_prefix_map: MultiArg<["-"], "cache-replay-prefix-map", 2>,
   HelpText<"Remap paths when replaying outputs from cache">, MetaVarName<"<prefix> <replacement>">;
 
 def register_module_dependency : Separate<["-"], "register-module-dependency">,
+  Flags<[NewDriverOnlyOption]>,
   HelpText<"Register module for dependency scan without importing in the frontend">;