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Textual module interfaces don't actually depend on SILGen, so we shouldn't need to run SILGen (or serialize an entire binary module) if we're just trying to emit a textual interface. On the other hand, if we /are/ going to run SILGen and then SIL diagnostics, we shouldn't delay those diagnostics by spending time emitting a textual interface, or for that matter a TBD file. Using this, update all the ModuleInterface tests that use `-emit-module -o /dev/null` to use `-typecheck` instead, except for those using `-merge-modules`.