common.allasm_aarch64_isa fails on 64-bit-only hardware

Created by: egrimley

The NZCV bits in the FPSR are not implemented (they are always read as zero) if AArch32 floating-point is not implemented.

The test allasm_aarch64_isa tries to set and read back the top bits (NZCV) of FPSR, for example here:

        mov     x3, #0xf8000000 // N, Z, C, V; QC
        movk    x3, #0x0000009f // IDC, IXC; UFC, OFC, DZC, IOC
        msr     fpsr, x3

I think there is another case of this elsewhere in the same file. It would be worth running all the tests on AArch64-only hardware to check.