Hi,

This patch adds support for MVE instructions VQDMLADH, VQRDMLADH, 
VQDMLSDH, and VQRDMLSDH.

gas/ChangeLog:

2019-05-01  Andre Vieira  <andre.simoesdiasvieira@arm.com>

	* config/tc-arm.c (do_mve_vqdmladh): New encoding function.
         (insns): Add entries for MVE mnemonics.
	* testsuite/gas/arm/mve-vqdmladh-bad.d: New test.
	* testsuite/gas/arm/mve-vqdmladh-bad.l: New test.
	* testsuite/gas/arm/mve-vqdmladh-bad.s: New test.
	* testsuite/gas/arm/mve-vqdmlsdh-bad.d: New test.
	* testsuite/gas/arm/mve-vqdmlsdh-bad.l: New test.
	* testsuite/gas/arm/mve-vqdmlsdh-bad.s: New test.