For-of statements do not permit initializers.

R=rossberg@chromium.org
BUG=v8:2720

Review URL: https://codereview.chromium.org/16739008

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15082 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Implemented function that returns code age.

This may be used to display debugging information.

BUG=
R=danno@chromium.org, mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/16509005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15083 ce2b1a6d-e550-0410-aec6-3dcde31c8c00