[Driver] Forward the -module-alias arguments from the driver to the frontend

Author: ahoppen

lib/Driver/ToolChains.cpp

@@ -350,6 +350,7 @@ void ToolChain::addCommonFrontendArgs(const OutputInfo &OI,
   inputArgs.AddLastArg(arguments, options::OPT_enable_builtin_module);
   inputArgs.AddLastArg(arguments, options::OPT_compiler_assertions);
   inputArgs.AddLastArg(arguments, options::OPT_load_pass_plugin_EQ);
+  inputArgs.AddAllArgs(arguments, options::OPT_module_alias);
 
   // Pass on any build config options
   inputArgs.AddAllArgs(arguments, options::OPT_D);