fix zero extending for mmio ld1/2/4 emulation in KVM

Xu, Anthony wrote:
>> unnecessary divergence is
>> undesirable. 
> 
> Good point, we should keep kvm/ia64 and xen/ia64 the
same code base as
> possible.

It would be nice, but the KVM codebase has already been
modified a lot,
just the reformatting in order to be acceptable to the Linux
kernel. I
don't think it's realistic to keep them identical.

Cheers,
Jes

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