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Many lists want to override only allocation semantics, or callbacks for iplist. Split these up to prevent code duplication. - Specialize ilist_alloc_traits to change the implementations of deleteNode() and createNode(). - One common desire is to do nothing deleteNode() and disable createNode(). Specialize ilist_alloc_traits to inherit from ilist_noalloc_traits for that behaviour. - Specialize ilist_callback_traits to use the addNodeToList(), removeNodeFromList(), and transferNodesFromList() callbacks. As a drive-by, add some coverage to the callback-related unit tests. llvm-svn: 280128