Do abstract the setting and restoring of 'argument' state into a
function that takes arguments.

Do not set the argument state in the code generator unless it
represents arguments to a recursive call to Visit.

Review URL: http://codereview.chromium.org/550010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3594 ce2b1a6d-e550-0410-aec6-3dcde31c8c00