Slava Pestov 1e94466bcc AST: Replace GenericSignature::createGenericEnvironment() with getGenericEnvironment() ...

This memoizes the result, which is fine for all callers; the only
exception is open existential types where each new open existential
now explicitly gets a unique generic environment, allocated by
calling GenericEnvironment::getIncomplete().

2019-09-06 17:16:03 -04:00

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