target-arm: Implement AArch64 DAIF system register
Implement the DAIF system register which is a view of the DAIF bits in PSTATE. To avoid needing a readfn, we widen the daif field in CPUARMState to uint64_t. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NPeter Crosthwaite <peter.crosthwaite@xilinx.com>
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