A64: Fix compiler warning in r19444.

BUG=
R=jochen@chromium.org

Review URL: https://codereview.chromium.org/167463004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19447 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fix merge-to-branch imports.

BUG=
TBR=ulan@chromium.org

Review URL: https://codereview.chromium.org/170513002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19448 ce2b1a6d-e550-0410-aec6-3dcde31c8c00