Slava Pestov 1954665a95 AST: Remove more uses of SubstitutionMap::add{Substitution,Conformance}() ...

A new SubstitutionMap::getProtocolSubstitutions() method handles
the case where we construct a trivial SubstitutionMap to replace
the protocol Self type with a concrete type.

When substituting one opened existential archetype for another,
use the form of Type::subst() that takes two callbacks instead of
building a SubstitutionMap. SubstitutionMaps are intended to be
used with keys that either come from a GenericSignature or a
GenericEnvironment, so using them to replace opened archetypes
doesn't fit the conceptual model we're going for.

2017-02-06 20:33:39 -08:00

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