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		3e8e8d2dad
		
			
		
	
	
	
	
		
			
			Stop tracking namespace in used_imports. This changes `used_imports` from a `FxHashSet<(NodeId, Namespace)>` to a `FxHashSet<NodeId>`, as the Namespace information isn't used. The only point that uses it did three lookups, `|=`'ing them together. r? `@estebank`