Joe Groff 3663c36284 IRGen: Begin NSObject subclass layout with an NSObject 'isa' header only. ...

We would lay out all classes starting with a Swift-style two-word header, even classes that inherit NSObject and therefore don't have Swift refcounting. The ObjC runtime would slide our ivars down for us at realization time, but it's nice to avoid unnecessarily dirtying memory in the not-uncommon case of direct NSObject subclasses.

2017-06-16 14:42:27 -07:00

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