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This SelectionDAG node will be attached to call nodes by LowerCall(), and eventually becomes a MO_RegisterMask MachineOperand on the MachineInstr representing the call instruction. LowerCall() will attach a register mask that depends on the calling convention. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148436 91177308-0d34-0410-b5e6-96231b3b80d8