[turbofan] InstructionSelector tests for ARM64 comparisons.

R=bmeurer@chromium.org, ulan@chromium.org

Review URL: https://codereview.chromium.org/567323002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23935 ce2b1a6d-e550-0410-aec6-3dcde31c8c00