[Bug backtrace/11999] New: Limit backtrace but display both its top+bottom frames

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

For example this backtrace
https://bugzilla.redhat.com/attachment.cgi?id=441089
shows only the bottom frames, one does not know how the dead-loop happened.
Backtracer limits the output to (1024) frames.

Provide an option to still support a limit but displaying both limit/2 bottom
frames and limit/2 top frames.

If the total number of frames is < limit then no change would happen.

Actual results:
#1022 0x00000000005b2cc5 in gnuv3_pass_by_reference (type=0x1044d3c8)
#1023 0x00000000005b2cc5 in gnuv3_pass_by_reference (type=0x1044d3c8)
<stop>

Expected results:
#1022 0x00000000005b2cc5 in gnuv3_pass_by_reference (type=0x1044d3c8)
#1023 0x00000000005b2cc5 in gnuv3_pass_by_reference (type=0x1044d3c8)
#393081 in some function a
#393082 in some function a
#393082 in main()

downstream Bug: https://bugzilla.redhat.com/show_bug.cgi?id=627497

-- 
           Summary: Limit backtrace but display both its top+bottom frames
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: backtrace
        AssignedTo: unassigned at sourceware dot org
        ReportedBy: jan dot kratochvil at redhat dot com
                CC: gdb-prs at sourceware dot org


http://sourceware.org/bugzilla/show_bug.cgi?id=11999

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