ARM64: Remove the unused 'SmiAbs'.

BUG=
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/572903003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23970 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Allow trace-codegen to dereference handles.

This fixes --print-all-code for some tests.

BUG=
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/574673002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23971 ce2b1a6d-e550-0410-aec6-3dcde31c8c00