[Bug runtime/16920] Add aarch64 backtrace support

["wcohen at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16920

--- Comment #1 from William Cohen <wcohen at redhat dot com> ---
kprobes is not yet generally available on aarch64 kernels.  With the current
git checkout of systemtap could do something like the following as a test of
functionality of the backtrace support:

stap --all-modules -e 'probe kernel.trace("sched_switch") {print_backtrace();
exit()}'

Should get something like the following:

# ../install/bin/stap --all-modules -e 'probe kernel.trace("sched_switch")
{print_backtrace(); exit()}'
WARNING: no or bad debug frame hdr
WARNING: No binary search table for eh frame, doing slow linear search for
stap_0c4277ebadb5154d1fa1d54d56112285__536
 0xffffffffa0973753 [stap_0c4277ebadb5154d1fa1d54d56112285__536+0x7753/0x0]
 0xffffffffa0974ae2 [stap_0c4277ebadb5154d1fa1d54d56112285__536+0x8ae2/0x0]
 0xffffffffa0975843 [stap_0c4277ebadb5154d1fa1d54d56112285__536+0x9843/0x0]
 0xffffffffa096c00e [stap_0c4277ebadb5154d1fa1d54d56112285__536+0xe/0x0]
 0xffffffff816f2500 : __schedule+0x360/0x740 [kernel]
 0xffffffff816f2909 : schedule+0x29/0x70 [kernel]
 0xffffffff816f200d : schedule_hrtimeout_range_clock+0x14d/0x170 [kernel]
 0xffffffff816f2043 : schedule_hrtimeout_range+0x13/0x20 [kernel]
 0xffffffff811fd689 : poll_schedule_timeout+0x49/0x70 [kernel]
 0xffffffff811fe0ce : do_select+0x5be/0x7a0 [kernel]
 0xffffffff811fe48b : core_sys_select+0x1db/0x300 [kernel]
 0xffffffff811fe7e3 : sys_pselect6+0x123/0x230 [kernel]
 0xffffffff816ff029 : system_call_fastpath+0x16/0x1b [kernel]

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