[PATCH] [ARM] fix some ld/st instruction with wirteback

[Jiangning Liu]

Renato,

For llvm.arm.neon.vld3.v1i64 plus 3*64 offset writeback, we can use vld1
>> with writeback to implement the same functionality, because ARM instruction
>> vld1 accept 64-bit vector list.
>>
>
> I understand that this is a different issue, but do we have to do this?
> Can't we just emit vld/vst 2/3/4?
>

I'm afraid we can't, because ARM ARM doesn't says vld/vst 2/3/4 support
64-bit vector.

Thanks,
-Jiangning
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