Hi,

This patch adds support for MVE instructions VCMP and VPT. These 
instructions allow the use of the scalar ZR (zero) register, this is 
encoded as register 15.

gas/ChangeLog:

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

	* config/tc-arm.c (MVE_BAD_QREG): New error message.
	(enum operand_parse_code): Define new operand.
	(parse_operands): Handle new operand.
	(do_mve_vpt): Change for VPT blocks.
	(NEON_SHAPE_DEF): New shape.
	(neon_logbits): Moved.
	(LOW4): Moved
	(HI1): Moved
	(mve_get_vcmp_vpt_cond): New function to translate vpt
         conditions.
	(do_mve_vcmp): New encoding function.
	(do_vfp_nsyn_cmp): Changed to support MVE variants.
	(insns): Change to support MVE variants of vcmp and add
         vpt.
	* testsuite/gas/arm/mve-vcmp-bad-1.d: New test.
	* testsuite/gas/arm/mve-vcmp-bad-1.l: New test.
	* testsuite/gas/arm/mve-vcmp-bad-1.s: New test.
	* testsuite/gas/arm/mve-vcmp-bad-2.d: New test.
	* testsuite/gas/arm/mve-vcmp-bad-2.l: New test.
	* testsuite/gas/arm/mve-vcmp-bad-2.s: New test.
	* testsuite/gas/arm/mve-vpt-bad-1.d: New test.
	* testsuite/gas/arm/mve-vpt-bad-1.l: New test.
	* testsuite/gas/arm/mve-vpt-bad-1.s: New test.
	* testsuite/gas/arm/mve-vpt-bad-2.d: New test.
	* testsuite/gas/arm/mve-vpt-bad-2.l: New test.
	* testsuite/gas/arm/mve-vpt-bad-2.s: New test.