Hi,

This patch adds support for MVE instructions VMLALDAV, VMLALV, VMLSLDAV, 
VRMLALDAVH, VRMLALVH, and VRMLSLDAVH.

gas/ChangeLog:

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

	* config/tc-arm.c (M_MNEM_vmlaldav, M_MNEM_vmlaldava,
         M_MNEM_vmlaldavx, M_MNEM_vmlaldavax, M_MNEM_vmlsldav,
         M_MNEM_vmlsldava, M_MNEM_vmlsldavx, M_MNEM_vmlsldavax,
         M_MNEM_vrmlaldavhx, M_MNEM_vrmlaldavhax, M_MNEM_vrmlsldavh,
         M_MNEM_vrmlsldavha, M_MNEM_vrmlsldavhx, M_MNEM_vrmlsldavhax):
         New instruction encodings.
	(NEON_SHAPE_DEF): New shape
	(mve_encode_rrqq): New encoding helper function.
	(do_mve_vmlaldav): New encoding function.
	(do_mve_vrmlaldavh): New encoding function.
         (insns): Add entries for MVE mnemonics.
	* testsuite/gas/arm/mve-vmlaldav-bad.d: New test.
	* testsuite/gas/arm/mve-vmlaldav-bad.l: New test.
	* testsuite/gas/arm/mve-vmlaldav-bad.s: New test.
	* testsuite/gas/arm/mve-vmlalv-bad.d: New test.
	* testsuite/gas/arm/mve-vmlalv-bad.l: New test.
	* testsuite/gas/arm/mve-vmlalv-bad.s: New test.
	* testsuite/gas/arm/mve-vmlsldav-bad.d: New test.
	* testsuite/gas/arm/mve-vmlsldav-bad.l: New test.
	* testsuite/gas/arm/mve-vmlsldav-bad.s: New test.
	* testsuite/gas/arm/mve-vrmlaldavh-bad.d: New test.
	* testsuite/gas/arm/mve-vrmlaldavh-bad.l: New test.
	* testsuite/gas/arm/mve-vrmlaldavh-bad.s: New test.