[PATCH] arc-repeated-use-of-weak should not warn about IBOutlet properties

[Bob Wilson via cfe-commits]

Revision r211132 was supposed to disable -Warc-repeated-use-of-weak for Objective-C properties marked with the IBOutlet attribute. Those properties are supposed to be weak but they are only accessed from the main thread so there is no risk of asynchronous updates setting them to nil. That combination makes -Warc-repeated-use-of-weak very noisy. The previous change only handled one kind of access to weak IBOutlet properties. Instead of trying to add checks for all the different kinds of property accesses, this patch removes the previous special case check and adds a check at the point where the diagnostic is reported. rdar://problem/21366461

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