[ARM] Fix ARM build attribute printing

[samparker]

Summary

lld tests caught that the attributes weren't being printed in the 'FileAttributes' scope.

[rengolin]

If this fixed http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/374, please commit ASAP.

[rengolin]

Right, your changes were reverted in r291911, so less urgency.

cheers,
--renato

lib/Support/ARMAttributeParser.cpp

       DictScope ASS(*SW, ScopeName);
       if (!Indicies.empty())
         SW->printList(IndexName, Indicies);
+      ParseAttributeList(Data, Offset, Length);
+    } else {
+      ParseAttributeList(Data, Offset, Length);
     }
-
-    ParseAttributeList(Data, Offset, Length);
   }
 }