[Patch][ObjC][Proposal] NSValue literals

[AlexDenisov]

Hi there.
Here is the final (from my point of view) version.
I can continue working on fixes/improvements after the review.
Current version includes:

- new ‘objc_boxed_nsvalue_expression’ feature
- new ‘objc_boxable’ attribute
- ObjCBoxedExpr with limited amount of sub-expressions
- Sema/CodeGen tests
- support of lvalues and rvalues
- ‘c-index-test’ and ‘ASTReader/ASTWriter’ adopted to support new ObjCBoxedExpr format, added tests to check if they’re working properly
- ‘ObjectiveCLiterals.rst’ includes all new features (though wording needs to be improved)

I guess I’m missing something here, but it’s just a brief overview of the content of the patch.

Looking forward for your feedback.

Best regards, Alex.
--
AlexDenisov
Software Engineer, http://alexdenisov.github.io

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