[Sheriff] Skip tests that fail with TF on arm64.

TBR=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/687653002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24944 ce2b1a6d-e550-0410-aec6-3dcde31c8c00