Tidy up IfaceEqualityTyCon
This commit commit 85aa1f42 Date: Sun Oct 29 20:48:19 2017 -0400 Fix #14390 by making toIfaceTyCon aware of equality was a bit over-complicated. This patch simplifies the (horribly ad-hoc) treatement of IfaceEqualityTyCon, and documents it better. No visible change in behaviour.
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