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[3.0] Foundation overlay: Fix optionality mismatch in NSMutableDictionary subscript. #4339

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jckarter
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setObject:forKey: takes a nonnull object, causing us to accidentally pass in a boxed Optional-in-an-Any from the Swift subscript's optional newValue. Fixes rdar://problem/27875914.

…ubscript.

`setObject:forKey:` takes a nonnull object, causing us to accidentally pass in a boxed Optional-in-an-Any from the Swift subscript's optional newValue. Fixes rdar://problem/27875914.
@jckarter
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@swift-ci Please test

@jckarter
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@swift-ci Please test OS X

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