[PATCH 21/57][Arm][GAS] Add support for MVE instructions: vmaxv, vmaxav, vminv and...

[PATCH 21/57][Arm][GAS] Add support for MVE instructions: vmaxv, vmaxav, vminv and vminav

gas/ChangeLog:
2019-05-16  Andre Vieira  <andre.simoesdiasvieira@arm.com>

	* config/tc-arm.c (M_MNEM_vmaxv, M_MNEM_vmaxav, M_MNEM_vminv,
	 M_MNEM_vminav): New instruction encodings.
	(do_mve_vmaxv): New encoding function.
	(insns): Add entries for new MVE mnemonics.
	* testsuite/gas/arm/mve-vmaxv-vminv-bad.d: New test.
	* testsuite/gas/arm/mve-vmaxv-vminv-bad.l: New test.
	* testsuite/gas/arm/mve-vmaxv-vminv-bad.s: New test.