Revert "Rewind additional parser state when reinterpreting arrow arguments"

This reverts r22906.

TBR=rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/440373003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22907 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Add convenience method to print types for debugging.

R=titzer@chromium.org, svenpanne@chromium.org

Review URL: https://codereview.chromium.org/435403002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22908 ce2b1a6d-e550-0410-aec6-3dcde31c8c00