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PHIElimination/createPHISourceCopy inserts non-branch terminators after the control flow pseudo if a successor phi reads a register defined by the control flow pseudo. If this happens, we need to split the expansion of the control flow pseudo to ensure all the branches are after all of the other mask management instructions. GlobalISel hit this in testscases that happened to be tail duplicated. The original testcase still does not work, since the same problem appears to be present in a later pass.
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