Make UniqDSet a newtype
For the same reasons as in #13114 (closed) and D3146 we should make UniqDSet a newtype of UniqDFM.
I wonder if we can also have a prettier Outputable instance this way.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 8.6.2 |
| Type | Task |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
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