[OPCODES][ARM]Fix mask for a few coprocessor opcodes.

[Nick Clifton]

Hi Renlin,

> opcodes/ChangeLog:
> 2016-02-18  Renlin Li  <renlin.li@arm.com>
> 
>      * arm-dis.c (coprocessor_opcodes): Fix mask for vsel, vmaxnm, vminnm,
>      vrint(mpna).
>      * testsuite/gas/arm/mask_1.d: New.
>      * testsuite/gas/arm/mask_1.s: New.

Approved - please apply.

Cheers
  Nick