Avoid trying to decode the raw inline constant which is part of the aged code prologue.

BUG=v8:3007
LOG=N
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/88303003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18097 ce2b1a6d-e550-0410-aec6-3dcde31c8c00