[PATCH 34/57][Arm][GAS] Add support for MVE instructions: vshl and vqshl

[PATCH 34/57][Arm][GAS] Add support for MVE instructions: vshl and vqshl

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_shl_imm): Accept MVE variants.
	(do_neon_shl): Likewise.
	(do_neon_qshl_imm): Likewise.
	(do_neon_qshl): Likewise.
	(do_neon_qshlu_imm): Likewise.
	(insns): Likewise.
	* testsuite/gas/arm/mve-vqshl-bad.d: New test.
	* testsuite/gas/arm/mve-vqshl-bad.l: New test.
	* testsuite/gas/arm/mve-vqshl-bad.s: New test.
	* testsuite/gas/arm/mve-vshl-bad.d: New test.
	* testsuite/gas/arm/mve-vshl-bad.l: New test.
	* testsuite/gas/arm/mve-vshl-bad.s: New test.