Update xctoolchain to latest.

nlutsenko · nlutsenko · commit a5fcbc57b9ff · 2016-07-14T12:17:02.000-07:00
diff --git a/Vendor/xctoolchain b/Vendor/xctoolchain
@@ -1 +1 @@
-Subproject commit a381a3f1b30fd7ff9180f3627ab241916b711b7d
+Subproject commit af8d7f69bf7a5b8e8edd94a139f83fc465b7b64a
