Hi,

This patch adds support for MVE instructions VDUP, VDDUP, VDWDUP, VIDUP, 
and VIWDUP.

gas/ChangeLog:

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

	* config/tc-arm.c (M_MNEM_vddup, M_MNEM_vdwdup, M_MNEM_vidup,
	M_MNEM_viwdup): New instruction encodings.
	(NEON_SHAPE_DEF): New shapes.
	(do_mve_viddup): New encoding function.
	(do_neon_dup): Change to support new MVE variants.
         (insns): Change existing to accept MVE variants and add new.
	* testsuite/gas/arm/mve-vddup-bad.d: New test.
	* testsuite/gas/arm/mve-vddup-bad.l: New test.
	* testsuite/gas/arm/mve-vddup-bad.s: New test.
	* testsuite/gas/arm/mve-vdup-bad.d: New test.
	* testsuite/gas/arm/mve-vdup-bad.l: New test.
	* testsuite/gas/arm/mve-vdup-bad.s: New test.
	* testsuite/gas/arm/mve-vidup-bad.d: New test.
	* testsuite/gas/arm/mve-vidup-bad.l: New test.
	* testsuite/gas/arm/mve-vidup-bad.s: New test.