Sebastian Graf authored Jan 17, 2020 and Marge Bot committed Feb 05, 2020

In #17703 (a follow-up of !2192), we established that contrary to my
belief, type constraints arising from existentials in code like

```hs
data Ex where Ex :: a -> Ex
f _ | let x = Ex @Int 15 = case x of Ex -> ...
```

are in fact useful.

This commit makes a number of refactorings and improvements to comments,
but fundamentally changes `addCoreCt.core_expr` to record the type
constraint `a ~ Int` in addition to `x ~ Ex @a y` and `y ~ 15`.

Fixes #17703.