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

Hi folks,

here's the bug: https://bugs.swift.org/browse/SR-12169.

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.

Here is a fix: https://github.com/apple/swift/pull/30250/files

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