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=marja@chromium.org, rossberg@chromium.org BUG=v8:3475 LOG=N Review URL: https://codereview.chromium.org/437393004 git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22906 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
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