In 5aaa8fb40681ee66282d73dab8c8eccbf5ee0518, TYPE_METHODS was removed and
TYPE_FIELDS replaced it.

In doing so, the scope of TYPE_FIELDS expanded, as it now output new tree
types.

The java frontend made heavy use of TYPE_METHODS and TYPE_FIELDS, and so I
am encountering numerous issues in my attempt to convert the TYPE_METHODS
calls into TYPE_FIELDS calls.

So, what did 5aaa8fb change? What does a TYPE_FIELD call output compared to
what it did before, and what subset of that is equivalent to what a
TYPE_METHOD call used to be?