MIPS: Move the genMachineCheckFault function near MachineCheckFault.
MIPS: Move the genMachineCheckFault function near MachineCheckFault.

Since they're so closely linked, they should be next to each other in the
file.

andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin