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PATCHPOINT is a strange pseudo-instruction. Depending on how it is used, and whether or not the AnyReg calling convention is being used, it might or might not define a value. However, its TableGen definition says that it defines one value, and so when it doesn't, the code in ScheduleDAGSDNodes::RegDefIter becomes confused and the code that uses the RegDefIter will try to get the register class of the MVT::Other type associated with the PATCHPOINT's chain result (under certain circumstances). This will be covered by the PPC64 PatchPoint test cases once that support is re-committed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225907 91177308-0d34-0410-b5e6-96231b3b80d8
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