AArch64: Constraint disassembler and assembler changes.

AArch64: Constraint disassembler and assembler changes.

This patch wires in the new constraint verifiers into the assembler and
disassembler.  Because of this the MOVPRFX tests have to be split out from the
generic SVE tests into their own tests so warnings can be ignored.

These tests are only intended to test the encoding correctness and not the
constraints.

gas/

	* testsuite/gas/aarch64/sve-movprfx.d: New test.
	* testsuite/gas/aarch64/sve-movprfx.s: New test.
	* testsuite/gas/aarch64/sve.d: Refactor.
	* testsuite/gas/aarch64/sve.s: Refactor.
        * testsuite/gas/aarch64/sysreg-diagnostic.d: Update.

opcodes/

	* aarch64-asm.c (aarch64_opcode_encode): Apply constraint verifier.
	* aarch64-dis.c (print_operands): Refactor to take notes.
	(print_verifier_notes): New.
	(print_aarch64_insn): Apply constraint verifier.
	(print_insn_aarch64_word): Update call to print_aarch64_insn.
	* aarch64-opc.c (aarch64_print_operand): Remove attribute, update notes format.