Binaries produced by Swift 5.2 betas crash while mapping optionals of Obj-C types annotated with objc_runtmie_name

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Hi folks,

here's the bug: [SR-12169] Using `objc_runtime_name` causes Swift 5.2 binary segmentation fault · Issue #54594 · apple/swift · GitHub.

I'm a bit worried it won't get addressed before Xcode 11.4 GM lands, that's why I'm posting here. I'd like to look into it myself, any pointers appreciated.

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Here is a fix: IRGen: Generate runtime type manglings using ObjC runtime names. by jckarter · Pull Request #30250 · apple/swift · GitHub

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