Backed out 3 changesets (bug 1409739) for failing at /dmd/test/test_dmd.js on a CLOSED TREE

Backed out changeset 39c8abcf9cb2 (bug 1409739)
Backed out changeset c0da83c08b62 (bug 1409739)
Backed out changeset 1192c15fc934 (bug 1409739)

taskcluster/taskgraph/target_tasks.py

@@ -553,6 +553,16 @@ def target_tasks_nightly_desktop(full_task_graph, parameters, graph_config):
     )
 
 
+# Opt DMD builds should only run nightly
+@_target_task('nightly_dmd')
+def target_tasks_dmd(full_task_graph, parameters, graph_config):
+    """Target DMD that run nightly on the m-c branch."""
+    def filter(task):
+        platform = task.attributes.get('build_platform', '')
+        return platform.endswith('-dmd')
+    return [l for l, t in full_task_graph.tasks.iteritems() if filter(t)]
+
+
 # Run Searchfox analysis once daily.
 @_target_task('searchfox_index')
 def target_tasks_searchfox(full_task_graph, parameters, graph_config):