structs: special slot generalization.

This lays the groundwork for optimizing access to more special
slots. Currently the equal method is handled specially; if a
type has an equal method, then this is cached for fast access,
so we are not doing a slot lookup each time the method needs
to be called. We would like a small array of such methods,
with minimal code duplication.

* struct.c (enum special_slot): New enum.
(struct struct_type): Scalar member eqmslot replaced by
spslot array.
(make_struct_type): Initialize elements of new array to null;
don't initialize removed eqmslot member.
(invalidate_special_slot_nonexistence): New static function.
(static_slot_set, static_slot_ens_rec): Use
invalidate_special_slot_nonexistence instead of open code.
(get_static_special_slot): General function for obtaining and
caching a special slot. Based on implementation of
get_equal_method.
(get_equal_method): Rewritten as a simple call to
get_special-static_slot.

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