Doug Gregor 3464929638 [ABI] Rework existential type metadata to use ProtocolDescriptorRef. ...

Use ProtocolDescriptorRefs within the runtime representation of
existential type metadata (TargetExistentialTypeMetadata) instead of
bare protocol descriptor pointers. Start rolling out the use of
ProtocolDescriptorRef in a few places in the runtime that touch this
code. Note that we’re not yet establishing any strong invariants on
the TargetProtocolDescriptorRef instances.

While here, replace TargetExistentialTypeMetadata’s hand-rolled pointer 
arithmetic with swift::ABI::TrailingObjects and centralize knowledge of
its layout better.

2018-07-20 20:54:49 -07:00

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