swift234

SIL: Add a backreference from SILModule to its originating Swift Module.

Ideally this wouldn't be necessary, but the type substitution APIs required by generic specialization and SIL verification currently require a Module* pointer, and it's obnoxious to have to pass it down separately everywhere it's needed. Longer-term the reliance on Modules for type substitution might be able to go away.

Swift SVN r9866