[PATCH][ARM][GAS]: Add support for vldmia/vldmdb/vstmia/vstmdb instructions in MVE.

[Nick Clifton]

Hi Srinath,

> This patch adds support for assembly instructions vldmia, vldmdb, vstmia and vstmdb in MVE.
> This instructions are already supported for Armv8-M Floating-point Extension.
> 
> Please refer to Arm-arm [1] for more details.
> 
> [1] https://developer.arm.com/architectures/cpu-architecture/m-profile/docs/ddi0553/latest/armv81-m-architecture-reference-manual
> 
> Regression tested on arm-none-eabi and found no regressions.
> 
> Ok for master ? and backports 2.34 and 2.33 ?

Approved for master and 2.33.  You can also check it in to the
2.34 branch if you can do it today (Friday).  I am creating the
release tomorrow, so Saturday will be too late...

Cheers
  Nick