Sebastian Graf authored Sep 18, 2019 and Marge Bot committed Oct 08, 2019

By introducing a `CoreMap Id` to the term oracle, we can represent
syntactically equivalent expressions by the same `Id`. Combine that with
`CoreOpt.simpleCoreExpr` and it might even catch non-trivial semantic
equalities.

Unfortunately due to scoping issues, this will not solve #17208 for
view patterns yet.