[Patch][ObjC][Proposal] NSValue literals

[AlexDenisov]

Finally I’ve figured out how-to check availability of BoxingMethod, Sema has method called ‘DiagnoseUseOfDecl’
New version attached. 
Updates:

 - support for NSEdgeInsets
 - tests for availability of boxing methods
 - test for __has_feature
 - cleanups and fixes based on previous comments

-- 
AlexDenisov
Software Engineer, https://github.com/AlexDenisov
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