forked from OSchip/llvm-project
				
			
				
					
						
							It doesn't make sense to unique self-referencing nodes. Drop uniquing for them. Note that `MDNode::intersect()` occasionally returns self-referencing nodes. Previously these would be returned by `MDNode::get()`. I'm not convinced this was intended behaviour -- to me it seems it should return a node whose only operand is the self-reference -- but I don't know much about alias scopes so I'm preserving it for now. This is part of PR21532. llvm-svn: 223618  | 
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