Fix PMP checks for misaligned accesses #2157
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`pmp_ok` needs to handle misaligned addresses and non-power-of-2 lengths, so round them before checking the PMPs. As an optimization, reduce the number of PMP checks based upon the PMP granularity.
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pmp_okneeds to handle misaligned addresses and non-power-of-2 lengths, so round them before checking the PMPs.As an optimization, reduce the number of PMP checks based upon the PMP granularity.