[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 #2 from William Cohen <wcohen at redhat dot com> ---
Created attachment 7819
  --> https://sourceware.org/bugzilla/attachment.cgi?id=7819&action=edit
Add backtrace support for aarch64

This should be reviewed by someone that know the dwarf unwinder such as Mark
Wielaard.  It shows some signs of life, but needs refinement as seen in the
really simple example below:

# ../install/bin/stap -v -e 'probe vfs.read {print_backtrace(); exit()}'
Pass 1: parsed user script and 104 library script(s) using
143168virt/32320res/4160shr/27904data kb, in 360usr/10sys/373real ms.
Pass 2: analyzed script: 1 probe(s), 2 function(s), 3 embed(s), 0 global(s)
using 250112virt/141632res/5888shr/134848data kb, in 3050usr/290sys/3345real
ms.
Pass 3: using cached
/root/.systemtap/cache/4a/stap_4a42bbbc96d58e126f190a21e7b5d726_1701.c
Pass 4: using cached
/root/.systemtap/cache/4a/stap_4a42bbbc96d58e126f190a21e7b5d726_1701.ko
Pass 5: starting run.
WARNING: no or bad debug frame hdr
WARNING: No binary search table for eh frame, doing slow linear search for
/usr/lib/debug/lib/modules/3.17.0-0.rc7.46.sa2.kprobev2.aarch64/vmlinux
 0xfffffe00001e00b8 : vfs_read+0x0/0x198 [kernel]
 0x0 (inexact)
Pass 5: run completed in 0usr/20sys/556real ms.

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