Remove unnecessary member variables in RecordWrite on ARM64.

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/538493002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23646 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Correctly overwrite author in chromium roll script.

BUG=408523
LOG=n
R=jarin@chromium.org
TBR=jarin@chromium.org

Review URL: https://codereview.chromium.org/535073002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23647 ce2b1a6d-e550-0410-aec6-3dcde31c8c00