[PATCH] MachineVerifier: Don't crash if MachineOperand has no parent

[Matt Arsenault]

> On Apr 29, 2015, at 3:30 PM, Quentin Colombet <qcolombet at apple.com> wrote:
> 
> Hi Matt,
> 
> Any chance you can add a test case?
> 
> Cheers,
> -Quentin

Not without intentionally adding a bug somewhere
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