[Apple Silicon][Test] Enable testing for arm64 macOS

Author: shahmishal

test/lit.cfg

@@ -828,7 +828,7 @@ if run_vendor == 'apple':
         'the swift_test_mode is "only_non_executable". Current '
         'swift_test_mode is {}.'.format(swift_test_mode))
 
-    if 'arm' in run_cpu:
+    if 'arm' in run_cpu and not (run_os == 'macosx' or run_os == 'maccatalyst'):
        # iOS/tvOS/watchOS device
        if run_os == 'ios':
            lit_config.note('Testing iOS ' + config.variant_triple)