[Patch][ObjC][Proposal] NSValue literals

[AlexDenisov]

> You can limit it to two if it makes the representation more efficient.

Yes, it does make sense. New version attached.
What’s new:

 - ObjCBoxedExpr sub-expressions now limited: two subexprs at max
 - RValues are working now: added tests, both Sema and CodeGen
 - added test for ‘c-index-test’
 - documentation updated

Looking forward for feedback.
--
AlexDenisov
Software Engineer, http://alexdenisov.github.io

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