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initial implementation of the darwin_objc unstable feature Tracking issue: https://github.com/rust-lang/rust/issues/145496 This feature makes it possible to reference Objective-C classes and selectors using the same ABI used by native Objective-C on Apple/Darwin platforms. Without it, Rust code interacting with Objective-C must resort to loading classes and selectors using costly string-based lookups at runtime. With it, these references can be loaded efficiently at dynamic load time. r? ```@tmandry``` try-job: `*apple*` try-job: `x86_64-gnu-nopt`