[cfe-commits] [Patch] Find Objective-C protocols via name lookup

[Douglas Gregor]

This little patch replaces the ObjCProtocols DenseMap within Sema with  
the use of name lookup to find protocols (they're in the IDNS_Protocol  
namespace). It's prettier and cleaner, but it's giving me a 0.9%  
slowdown. So, I'm archiving it here and not committing it.

	- Doug

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