Pavel Yaskevich 497d42d90e [ConstraintSystem] Add a new constraint which connects base with result of the member chain ...

The first type represents a result of an unresolved member chain,
and the second type is its base type. This constraint acts almost
like `Equal` but also enforces following semantics:

- It's possible to infer a base from a result type by looking through
  this constraint, but it's only solved when both types are bound.

- If base is a protocol metatype, this constraint becomes a conformance
  check instead of an equality.

2021-02-23 11:33:10 -08:00

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