Jordan Rose fc99de452d Foundation: resolve some warnings (#16078) ...

- JSONEncoder.swift: tell the compiler that yes, this is supposed to
  be casting to 'T' and not 'T?'.

- NSObject.swift: mark NSKeyValueObservation members explicitly @objc
  and @nonobjc.

- NSStringAPI.swift: remove unnecessary @usableFromInline.

No intended functionality change.

2018-05-01 15:41:21 -07:00

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