target/arm: [a64] Move page and ss checks to init_disas_context
Since AArch64 uses a fixed-width ISA, we can pre-compute the number of insns remaining on the page. Also, we can check for single-step once. Reviewed-by: NEmilio G. Cota <cota@braap.org> Signed-off-by: NRichard Henderson <rth@twiddle.net>
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