Rewind additional parser state when reinterpreting arrow arguments

The new ParserCheckpoint mechanism resets some state, notably the
bailout ID counter but also some statement counters (only applicable
once we get "do" expressions) when we decide to reinterpret a comma
expression as arrow function arguments.

R=rossberg@chromium.org, marja@chromium.org
BUG=v8:3475
LOG=N

Review URL: https://codereview.chromium.org/443903003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22925 ce2b1a6d-e550-0410-aec6-3dcde31c8c00