Merge "Track libcore commit cf86f3319e738c76c5e97ad95bb8a4e30654a787"
am: 51206e5

* commit '51206e53e17d156f14e22c9879e4f0240bd76263':
  Track libcore commit cf86f3319e738c76c5e97ad95bb8a4e30654a787

Change-Id: I1f4705cfa7a360f3d263381acc84ecfedf150bb7