[Bug backtrace/16558] New: GDB Aarch64 signal frame unwinder issue

["teawater at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16558

            Bug ID: 16558
           Summary: GDB Aarch64 signal frame unwinder issue
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: backtrace
          Assignee: unassigned at sourceware dot org
          Reporter: teawater at gmail dot com

The signal frame unwinder in GDB on Aarch64 seems to have troubles, e.g.
the frame where the signal was triggered is skipped.  Seen in:

(gdb) PASS: gdb.base/relativedebug.exp: continue
bt
#0  0x0000007fb7e1d5dc in __GI_raise (sig=sig@entry=6) at
../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1  0x0000007fb7e20aac in __GI_abort () at abort.c:89
#2  0x0000000000400850 in handler (signo=14) at
/scratch/macro/aarch64-linux-wrs/src/gdb-7.6-yocto/gdb/testsuite/gdb.base/relativedebug.c:25
#3  <signal handler called>
#4  main () at
/scratch/macro/aarch64-linux-wrs/src/gdb-7.6-yocto/gdb/testsuite/gdb.base/relativedebug.c:33
FAIL: gdb.base/relativedebug.exp: pause found in backtrace

where pause's frame is missing between #3 and #4 and also in other test
cases where also other frame data is incorrect.

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