Hamish Knight 71882996ca [CS] Adjust applied overload simplification ...

Currently `simplifyAppliedOverloads` depends on
the order in which constraints are simplified,
specifically that a lookup constraint for a
function gets simplified before the applicable
function constraint. This happens to work out
just fine today with the order in which we
re-activate constraints, but I'm planning on
changing that order.

This commit changes the logic such that it it's no
longer affected by the order in which constraints
are simplified. We'll now run it when either an
applicable function constraint is added, or a new
bind overload disjunction is added. This also
means we no longer need to run it potentially
multiple times when simplifying the applicable fn.

2020-03-29 18:33:59 -07:00

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