[DeadMachineInstructionElim] NFC: Provide DeadMachineInstructionInfo #121818
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Provide DeadMachineInstructionInfo interface so independent passes have access to ad-hoc isDead queries / eliminateDeadMI walks. LivePhysRegs is optional in isDead for the case where a user wants to pessimistically check deadness of a single MI without doing the LivePhysReg walk.