The final batch of changes for the new coercion representation
* Fix bugs in the packing and unpacking of data constructors with equality predicates in their types * Remove PredCo altogether; instead, coercions between predicated types (like (Eq a, [a]~b) => blah) are treated as if they were precisely their underlying representation type Eq a -> ((~) [a] b) -> blah in this case * Similarly, Type.coreView no longer treats equality predciates specially. * Implement the cast-of-coercion optimisation in Simplify.simplCoercionF Numerous other small bug-fixes and refactorings. Annoyingly, OptCoercion had Windows line endings, and this patch switches to Unix, so it looks as if every line has changed.
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