Jordan Rose a6ae2d7742 Hack: Force UIEdgeInsets.zero to always come from the SDK (#17122) ...

...instead of relying on the one in the overlay in pre-4.2 versions of
Swift. This caused crashes in deserialization, which (deliberately)
doesn't respect availability.

There are three changes here:

- Remove UIEdgeInsets.zero and UIOffset.zero from the UIKit overlay.
- Always use the 4.2 name for UIEdgeInsetsZero and UIOffsetZero from
  the underlying UIKit framework. (This is the nested name.)
- Ignore the unavailability messages for those two constants in
  pre-4.2 Swift, since we're now relying on them being present.

The latter two, the compiler changes, can go away once UIKit's API
notes no longer specify different pre-4.2 behavior, but meanwhile we
need to keep compatibility with the SDKs released in Xcode 10b1.

https://bugs.swift.org/browse/SR-7879

2018-06-12 13:40:23 -07:00

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