lit.cfg: recognize armv7s as a supported architecture

Author: gribozavr

test/lit.cfg

@@ -546,7 +546,7 @@ if run_vendor == 'apple':
            lit_config.note('Testing watchOS ' + config.variant_triple)
            xcrun_sdk_name = "watchos"
 
-       if run_cpu == "armv7" or run_cpu == "armv7k":
+       if run_cpu == "armv7" or run_cpu == "armv7s" or run_cpu == "armv7k":
            config.target_swiftmodule_name = "arm.swiftmodule"
            config.target_swiftdoc_name = "arm.swiftdoc"
        elif run_cpu == "arm64":