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If two uses of a CopyFromReg want different regclasses, first try a common sub-class, then fall back on the copy emitted in AddRegisterOperand. There is no need for an assert here. The cross-class joiner usually cleans up nicely. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79193 91177308-0d34-0410-b5e6-96231b3b80d8