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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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223618 91177308-0d34-0410-b5e6-96231b3b80d8 |
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