Slava Pestov 1d427eaa12 AST: Add request to compute protocol structural requirements and dependencies ...

These will be used by the RequirementMachine to compute requirement
signatures. For now, they're not hooked up.

ProtocolDecl::getStructuralRequirements() produces a list of Requirements
with SourceLocs from the structural types written in the protocol's
inheritance clause and 'where' clauses.

ProtocolDecl::getProtocolDependencies() produces a list of protocols which
appear on the right hand side of the protocol's conformance requirements.

2021-09-28 14:31:32 -04:00

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