Add import of the DebugifyBuilder that I forgot in llvm#555.

Author: dyung

buildbot/osuosl/master/config/builders.py

@@ -18,6 +18,7 @@
 from zorg.buildbot.builders import XToolchainBuilder
 from zorg.buildbot.builders import TestSuiteBuilder
 from zorg.buildbot.builders import BOLTBuilder
+from zorg.buildbot.builders import DebugifyBuilder
 
 from zorg.buildbot.builders import HtmlDocsBuilder
 from zorg.buildbot.builders import DoxygenDocsBuilder