Bug 1372575: set osx test tasks to tier 1. r=garndt

MozReview-Commit-ID: 665BesH9Eex

--HG--
extra : rebase_source : f683183e7522e904cdae7b1e2591dc300ac3da11

taskcluster/taskgraph/transforms/tests.py

@@ -442,6 +442,8 @@ def set_tier(config, tests):
                                          'linux64-pgo/opt',
                                          'linux64-devedition/opt',
                                          'linux64-asan/opt',
+                                         'macosx64/opt',
+                                         'macosx64/debug',
                                          'android-4.3-arm7-api-15/opt',
                                          'android-4.3-arm7-api-15/debug',
                                          'android-4.2-x86/opt']: