UBSAN stable runtime more generic with arm* targets

llvm-svn: 219924

compiler-rt/test/ubsan/lit.common.cfg

@@ -53,5 +53,5 @@ if config.host_os not in ['Linux', 'Darwin']:
 
 # Allow tests to use REQUIRES=stable-runtime.  For use when you cannot use XFAIL
 # because the test hangs or fails on one configuration and not the other.
-if config.target_arch != 'arm':
+if config.target_arch.startswith('arm') == False:
   config.available_features.add('stable-runtime')