Include config.swift_test_options in config.target_swift_frontend for non-macOS platforms.

Author: tkremenek

test/lit.cfg

@@ -768,8 +768,9 @@ elif run_os in ['linux-gnu', 'linux-gnueabihf', 'freebsd', 'windows-cygnus', 'wi
         % (config.swiftc, config.variant_triple, resource_dir_opt, mcp_opt,
            config.swift_test_options, swift_execution_tests_extra_flags))
     config.target_swift_frontend = (
-        '%s -frontend -target %s %s %s'
-        % (config.swift, config.variant_triple, resource_dir_opt, mcp_opt))
+        '%s -frontend -target %s %s %s %s'
+        % (config.swift, config.variant_triple, resource_dir_opt, mcp_opt,
+        config.swift_test_options))
     subst_target_swift_frontend_mock_sdk = config.target_swift_frontend
     subst_target_swift_frontend_mock_sdk_after = ""
     config.target_run = ''