Slava Pestov 9c3b514c7e AST: New getExistentialLayout() method on TypeBase and CanType ...

This consolidates calculations which need to look at every
protocol in an existential type. Soon we will also have to
deal with superclass constrained existentials, so start
updating call sites that look at all protocols to use the
new ExistentialLayout and correctly handle a class constraint
as well.

Also, eventually I will kill off the AnyObject protocol and
model it as a protocol composition with no protocols or
superclass, but the requiresClass() flag set.

This is not quite modeled this way yet and AnyObject still
exists, but the new abstraction is a step in the right
direction.

2017-04-10 17:04:37 -07:00

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