lit: use -ignore-module-source-info when testing compiler front-end

Author: nkcsgexi

test/lit.cfg

@@ -878,7 +878,7 @@ if run_vendor == 'apple':
     config.target_sdk_name = xcrun_sdk_name
     config.target_ld = "%s ld -L%r" % (xcrun_prefix, make_path(test_resource_dir, config.target_sdk_name))
     config.target_swift_frontend = (
-        "%s -frontend %s -sdk %r %s %s " %
+        "%s -frontend %s -sdk %r %s %s -ignore-module-source-info" %
         (config.swiftc, target_options, config.variant_sdk,
          config.swift_test_options, config.swift_frontend_test_options))
     subst_target_swift_frontend_mock_sdk = (