Slava Pestov c040c71ea9 AST: Remove some unnecessary SubstitutionList copies ...

ASTContext::getSpecializedConformance() already copies the
substitutions, so remove some AllocateCopy() calls.

Also, add a new overload taking a SubstitutionMap instead.
This allows removing some gatherAllSubstitutions() calls,
which have an allocation inside them.

Finally, remove the now-unused ModuleDecl parameter from
ProtocolConformance::subst() and make it public.

2017-03-07 15:59:05 -08:00

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