Split up `pretty_print` and `print`.

Split up `pretty_print` and `print`.

`pretty_print` takes a `Token` and `match`es on it. But the particular
`Token` kind is known at each call site, so this commit splits it into
five functions: `pretty_print_eof`, `pretty_print_begin`, etc.

This commit also does likewise with `print`, though there is one
callsite for `print` where the `Token` kind isn't known, so a generic
`print` has to stay (but it now just calls out to the various `print_*`
functions).