[llvm] r294993 - GlobalISel: represent atomic loads & stores via the MachineMemOperand.

[Tim Northover via llvm-commits]

> Do we have a way to "stomp on anyone that tries" automatically?

Well, dropping a new "MachineMemOperandOperand" would be detected automatically when the verifier checks the instruction has the correct number of operands. Other than that, only code review; but I think it's pretty unlikely someone will break it accidentally.

Tim.