This patch switches the aarch64 gdbserver ps_get_thread_area() 
implementation from PTRACE_GET_THREAD_AREA to PTRACE_GETREGSET.

OK?

/Marcus

2013-02-06  Marcus Shawcroft  <marcus.shawcroft@arm.com>

        * linux-aarch64-low.c (ps_get_thread_area): Replace
        PTRACE_GET_THREAD_AREA with PTRACE_GETREGSET.