[PATCH 8/57][Arm][GAS] Add support for MVE instructions: vcvt

[PATCH 8/57][Arm][GAS] Add support for MVE instructions: vcvt

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

	* config/tc-arm.c (enum operand_parse_code): Add new operand.
	(parse_operands): Handle new operand.
	(do_neon_cvt_1): Handle MVE variants.
	(do_neon_cvttb_1): Likewise.
	(insns): Accept MVE variants.
	* testsuite/gas/arm/mve-vcvt-bad-1.d: New test.
	* testsuite/gas/arm/mve-vcvt-bad-1.l: New test.
	* testsuite/gas/arm/mve-vcvt-bad-1.s: New test.
	* testsuite/gas/arm/mve-vcvt-bad-2.d: New test.
	* testsuite/gas/arm/mve-vcvt-bad-2.l: New test.
	* testsuite/gas/arm/mve-vcvt-bad-2.s: New test.
	* testsuite/gas/arm/mve-vcvt-bad-3.d: New test.
	* testsuite/gas/arm/mve-vcvt-bad-3.l: New test.
	* testsuite/gas/arm/mve-vcvt-bad-3.s: New test.
	* testsuite/gas/arm/mve-vcvt-bad-4.d: New test.
	* testsuite/gas/arm/mve-vcvt-bad-4.l: New test.
	* testsuite/gas/arm/mve-vcvt-bad-4.s: New test.
	* testsuite/gas/arm/mve-vcvt-bad.d: New test.
	* testsuite/gas/arm/mve-vcvt-bad.l: New test.
	* testsuite/gas/arm/mve-vcvt-bad.s: New test.