AArch64: Add MOVPRFX tests and update testsuite

AArch64: Add MOVPRFX tests and update testsuite

This patch adds the tests and expected output for each of the conditions where
the MOVPRFX constraint should apply.

The specific test cases are all documented to indicate what the expected
behavior should be.

gas/

        * testsuite/gas/aarch64/sve-movprfx_1.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_1.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_10.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_10.l: New test.
        * testsuite/gas/aarch64/sve-movprfx_10.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_11.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_11.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_12.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_12.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_13.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_13.l: New test.
        * testsuite/gas/aarch64/sve-movprfx_13.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_14.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_14.l: New test.
        * testsuite/gas/aarch64/sve-movprfx_14.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_15.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_15.l: New test.
        * testsuite/gas/aarch64/sve-movprfx_15.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_16.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_16.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_17.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_17.l: New test.
        * testsuite/gas/aarch64/sve-movprfx_17.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_18.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_18.l: New test.
        * testsuite/gas/aarch64/sve-movprfx_18.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_19.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_19.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_2.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_2.l: New test.
        * testsuite/gas/aarch64/sve-movprfx_2.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_20.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_20.l: New test.
        * testsuite/gas/aarch64/sve-movprfx_20.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_21.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_21.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_22.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_22.l: New test.
        * testsuite/gas/aarch64/sve-movprfx_22.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_23.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_23.l: New test.
        * testsuite/gas/aarch64/sve-movprfx_23.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_24.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_24.l: New test.
        * testsuite/gas/aarch64/sve-movprfx_24.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_25.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_25.l: New test.
        * testsuite/gas/aarch64/sve-movprfx_25.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_26.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_26.l: New test.
        * testsuite/gas/aarch64/sve-movprfx_26.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_3.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_3.l: New test.
        * testsuite/gas/aarch64/sve-movprfx_3.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_4.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_4.l: New test.
        * testsuite/gas/aarch64/sve-movprfx_4.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_5.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_5.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_6.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_6.l: New test.
        * testsuite/gas/aarch64/sve-movprfx_6.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_7.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_7.l: New test.
        * testsuite/gas/aarch64/sve-movprfx_7.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_8.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_8.l: New test.
        * testsuite/gas/aarch64/sve-movprfx_8.s: New test.
        * testsuite/gas/aarch64/sve-movprfx_9.d: New test.
        * testsuite/gas/aarch64/sve-movprfx_9.l: New test.
        * testsuite/gas/aarch64/sve-movprfx_9.s: New test.