SILGen: Emit property descriptors for (some) decls that need them. #15034
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If a property or subscript is referenceable from other modules, we need to give it a descriptor so that we can reliably build an equivalent key path in or out of that module. There are some cases that we should handle but don't yet: - Global and static properties ought to be key-path-able someday, so we should make descriptors for them, but this might need a new key path component kind. - Subscripts with indexes that aren't Hashable in the current module ought to get descriptors too, in case we ever support non-hashable key path components, and also because a generic subscript might be substituted with Hashable types by an external user, or an external module might post-hoc extend a type to be Hashable, so we really need to change things so that the client supplies the hashing and equality implementations for the indexes instead of the descriptor.
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If a property or subscript is referenceable from other modules, we need to give it a descriptor so that we can reliably build an equivalent key path in or out of that module.
There are some cases that we should handle but don't yet: