Allan Shortlidge a621059f80 ModuleInterface: Avoid crashing on invalid extensions in lazy typechecking mode. ...

With `-experimental-lazy-typecheck` specified during module interface emission,
`collectProtocols()` may be the first piece of code to request the extended
type for a given extension and it therefore needs to ignore invalid extensions
and ensure that diagnostics are emitted.

Also, add some `PrettyStackTrace` coverage to `ModuleInterfaceSupport.cpp` to make
investigating future issues easier.

Resolves rdar://126232836.

2024-07-23 10:32:50 -07:00

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