Hi,

This patch adds support for MVE instructions VQMOVNT, VQMOVNB, VQMOVUNT, 
VQMOVUNB, VQRSHL, and VRSHL.

gas/ChangeLog:

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

	* config/tc-arm.c (M_MNEM_vqmovnt, M_MNEM_vqmovnb,
         M_MNEM_vqmovunt, M_MNEM_vqmovunb): New instruction encodings.
	(do_mve_vqmovn): New encoding function.
	(do_neon_rshl): Change to accepte MVE variants.
         (insns): Change entries and add new for MVE mnemonics.
	* testsuite/gas/arm/mve-vqmovn-bad.d: New test.
	* testsuite/gas/arm/mve-vqmovn-bad.l: New test.
	* testsuite/gas/arm/mve-vqmovn-bad.s: New test.
	* testsuite/gas/arm/mve-vqrshl-bad.d: New test.
	* testsuite/gas/arm/mve-vqrshl-bad.l: New test.
	* testsuite/gas/arm/mve-vqrshl-bad.s: New test.
	* testsuite/gas/arm/mve-vrshl-bad.d: New test.
	* testsuite/gas/arm/mve-vrshl-bad.l: New test.
	* testsuite/gas/arm/mve-vrshl-bad.s: New test.