Goto definition works for `S { a: }` case

What happens here is that we lower `: ` to a missing expression, and
then correctly record that the corresponding field expression resolves
to a specific field. Where we fail is in the mapping of syntax to this
missing expression. Doing it via `ast_field.expr()` fails, as that
expression is `None`. Instead, we go in the opposite direcition and ask
each lowered field about its source.

This works, but has wrong complexity `O(N)` and, really, the
implementation is just too complex. We need some better management of
data here.

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