[PATCH] ARC + collection literal fix

[Jesse Rusak]

Hi John,

I've put together a tiny patch which fixes a potential early release in collection literals under ARC, based on our conversation from cfe-dev: http://lists.cs.uiuc.edu/pipermail/cfe-dev/2013-March/028527.html

The patch uses the machinery you added for the @clang.arc.use call, and adds some checks for the presence of that call in the existing Objective-C literal tests. 

Please let me know if there's anything here that needs adjustment.

Thanks,
Jesse
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