[Bug backtrace/18058] New: provide jit api with some control over sniffer priority

["tromey at sourceware dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18058

            Bug ID: 18058
           Summary: provide jit api with some control over sniffer
                    priority
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: backtrace
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org

Currently I think the JIT frame unwinder is given a fairly
high priority:

      frame_unwind_prepend_unwinder (gdbarch, &jit_frame_unwind);

In my case, I think the resulting sniffer will necessarily have
to use a heuristic to decide if it is looking at a JIT frame.
So, it would be nice to be able to specify that this unwinder
should come after any sniffer that works off the debug info,
as those are probably more reliable.

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