This issue came to light in the recent review of aarch64-linux-nat, and 
also needs resolving in GDBserver.

OK?

/Marcus

2013-02-07  Marcus Shawcroft  <marcus.shawcroft@arm.com>

        * linux-aarch64-low.c (aarch64_arch_setup): Fix clamping of
        aarch64_num_wp_regs and aarch64_num_bp_regs.