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dc052e6364
The central thrust of this patch is to get these metadata initializations off of `swift_once` and onto the metadata-request system where we can properly detect and resolve dependencies. We do this by first introducing runtime support for resolving metadata requests for "in-place" initializations (committed previously) and then teaching IRGen to actually generate code to use them (this patch). A non-trivial amount of this patch is just renaming and refactoring some of existing infrastructure that was being used for in-place initializations to try to avoid unnecessary confusion. The remaining cases that are still using `swift_once` resolution of metadata initialization are: - non-generic classes that can't statically fill their superclass or have resilient internal layout - foreign type metadata Classes require more work because I'd like to switch at least the resilient-superclass case over to using a pattern much more like what we do with generic class instantiation. That is, I'd like in-place initialization to be reserved for classes that actually don't need relocation. Foreign metadata should also be updated to the request/dependency scheme before we declare ABI stability. I'm not sure why foreign metadata would ever require a type to be resolved, but let's assume it's possible. Fixes part of SR-7876.