tests/tcg/arm: Use vmrs/vmsr instead of mcr/mrc

tests/tcg/arm: Use vmrs/vmsr instead of mcr/mrc

Clang 14 generates

/home/rth/qemu/src/tests/tcg/arm/fcvt.c:431:9: error: invalid operand for instruction
    asm("mrc p10, 7, r1, cr1, cr0, 0\n\t"
        ^
<inline asm>:1:6: note: instantiated into assembly here
        mrc p10, 7, r1, cr1, cr0, 0
            ^
/home/rth/qemu/src/tests/tcg/arm/fcvt.c:432:32: error: invalid operand for instruction
        "orr r1, r1, %[flags]\n\t"
                               ^
<inline asm>:3:6: note: instantiated into assembly here
        mcr p10, 7, r1, cr1, cr0, 0
            ^

This is perhaps a clang bug, but using the neon mnemonic is clearer.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <20240630190050.160642-14-richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240705084047.857176-19-alex.bennee@linaro.org>