On ARM64, HasListItem() isn't used, so the compiler complains. Use the
preprocessor to remove it from ARM64 builds.

BUG=
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/285463003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21285 ce2b1a6d-e550-0410-aec6-3dcde31c8c00