Slava Pestov 45fb11ce3c AST: Add ExistentialLayout::getSuperclass(), rename superclass to explicitSuperclass ...

More groundwork for protocols with superclass constraints.
In several places we need to distinguish between existential
types that have a superclass term (MyClass & Proto) and
existential types containing a protocol with a superclass
constraint.

This is similar to how I can write 'AnyObject & Proto', or
write 'Proto1 & Proto2' where Proto1 has an ': AnyObject'
in its inheritance clause.

Note that some of the usages will be revisited later as
I do more refactoring and testing. This is just a first pass.

2018-07-02 22:06:33 -07:00

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