[PATCH] MachineVerifier: Handle the optional def operand in a PATCHPOINT instruction.

[Alex L via llvm-commits]

Hi,

The PATCHPOINT instructions have a single optional defined register operand,
but the machine verifier can't verify the optional defined register
operands.

So, this patch makes sure that the machine verifier won't report an error
when a PATCHPOINT
instruction doesn't have its optional defined register operand.

This change will allow us to enable the machine verifier for the code
generation tests for the
patchpoint intrinsics.

Cheers,
Alex
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