[PATCH] MachineVerifier: Allow undef reads if a matching superreg is defined.

[Matthias Braun]

There are several test cases failing when enabling subregister liveness for the ARM target, you need this piece of code and an additional patch I haven't published yet to fix them. So I don't think this requires further tests.

Greetings
    Matthias

> On Jan 14, 2015, at 2:13 PM, Quentin Colombet <qcolombet at apple.com> wrote:
> 
> Hi Matthias,
> 
> LGTM.
> I guess this was failing only when sub register liveness will be enabled by default.
> Could you add in the related PR the test case that we would need to commit to match-up this patch?
> 
> Thanks,
> -Quentin
> 
> 
> http://reviews.llvm.org/D6973
> 
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