[Patch][ObjC][Proposal] NSValue literals

[AlexDenisov]

Seems I’ve addressed and fixed all the comments/remarks.
ATM I have another issue: I added test for objc_boxable into the test/PCH/subscripting-literals.m and now clang crashes, I’m still trying to find and fix the problem, but decided to send the new patch version so you can check if I’m on the right way.

P.S. re: crashing test
after de-serialization something goes wrong with the second parameter of ObjCBoxedExpr  and valueWithBytes:objCType: and clang segfaults.
I also attach the stack-trace of the crash if you, by any chance, want to take a look and give me some hint/direction to dig.
--
AlexDenisov
Software Engineer, http://alexdenisov.github.io

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