bug 1372412 - reenable osx opt builds on beta. r=catlee a=release CLOSED TREE

MozReview-Commit-ID: 97wCvP64neG

--HG--
extra : transplant_source : -UZ-%DBg%AA%E0%B5%D4%E5%27i%ABK-T%C4%A3%5B

taskcluster/taskgraph/target_tasks.py

@@ -247,7 +247,7 @@ def target_tasks_mozilla_beta(full_task_graph, parameters):
         if platform in ('macosx64-nightly', 'win64-nightly'):
             # Don't do some nightlies on-push until it's ready.
             return False
-        if platform in ('linux64', 'linux', 'macosx64'):
+        if platform in ('linux64', 'linux'):
             if task.attributes['build_type'] == 'opt':
                 return False
         # skip l10n, beetmover, balrog