Track libcore commit cf86f3319e738c76c5e97ad95bb8a4e30654a787

Bug: 27960078
Change-Id: If89390ad1ddc3088a8552107bf27a51b1d3c6d02
(cherry picked from commit 2513fc3b7eb3a8b668fcf280cc8ed45bd20e1893)
2 files changed