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ee06e126b7
Add API to indicate whether an `MDNode` is distinct. A distinct node is not stored in the MDNode uniquing tables, and will never be returned by `MDNode::get()`. Although distinct nodes are only currently created by uniquing collisions (when operands change), PR22111 will allow these nodes to be explicitly created. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225401 91177308-0d34-0410-b5e6-96231b3b80d8
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