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The code here is recursively Select-ing a new Node to avoid issues where N is CSE'd during replaceDAGValue and stops being valid. We can accomplish the same goal in a more principled way by using a HandleSDNode. This is essentially a less dodgy fix for PR25733 than the original attempt back in r255120. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268590 91177308-0d34-0410-b5e6-96231b3b80d8
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