Deinitializers are always @objc. (Arguably, this makes it unnecessary
to print, but we don't want to do any @objc inference at all in a
swiftinterface.)
- Use the name for the cached module, so that we don't end up with a
zillion "x86_64-XXXXXXXX.swiftmodule" files in the cache when we're
working with architecture-specific swiftmodules.
- Diagnose if the expected name is different from the name specified
in the swiftinterface.
- Emit all diagnostics at the location of the import, instead of
without any location at all.
This would break resilience, which makes a distinction between "SIL
only inside the module, which is inside the resilience domain" and
"SIL we're going to serialize, which is outside the resilience
domain".
