cpu_ldst.h: Allow NB_MMU_MODES to be 7
Support guest CPUs which need 7 MMU index values. Add a comment about what would be required to raise the limit further (trivial for 8, TCG backend rework for 9 or more). Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NGreg Bellows <greg.bellows@linaro.org> Reviewed-by: NRichard Henderson <rth@twiddle.net>
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