[Bug python/16483] New: "info frame-filter" too verbose with many objfiles

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

https://sourceware.org/bugzilla/show_bug.cgi?id=16483

            Bug ID: 16483
           Summary: "info frame-filter" too verbose with many objfiles
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at redhat dot com

If you have many objfiles and invoke "info frame-filter",
it prints something about each one, even if just to say
that the objfile has no filters.  I think it would be
better to only mention objfiles that actually do have
filters.  Example:

(gdb) info frame-filter 
global frame-filters:
  Priority  Enabled  Name
  100       Yes      glib

progspace /tmp/S frame-filters:
  No frame filters registered.

objfile /tmp/S frame-filters:
  No frame filters registered.
objfile /usr/lib/debug/lib64/ld-2.16.so.debug frame-filters:
  No frame filters registered.
objfile /lib64/ld-linux-x86-64.so.2 frame-filters:
  No frame filters registered.
objfile system-supplied DSO at 0x7ffff7ffd000 frame-filters:
  No frame filters registered.
objfile /usr/lib/debug/usr/lib64/libgobject-2.0.so.0.3400.2.debug
frame-filters:
  No frame filters registered.
objfile /lib64/libgobject-2.0.so.0 frame-filters:
  No frame filters registered.
objfile /usr/lib/debug/usr/lib64/libglib-2.0.so.0.3400.2.debug frame-filters:
  No frame filters registered.
objfile /lib64/libglib-2.0.so.0 frame-filters:
  No frame filters registered.
objfile /usr/lib/debug/lib64/libc-2.16.so.debug frame-filters:
  No frame filters registered.
objfile /lib64/libc.so.6 frame-filters:
  No frame filters registered.
objfile /usr/lib/debug/usr/lib64/libgthread-2.0.so.0.3400.2.debug
frame-filters:
  No frame filters registered.
objfile /lib64/libgthread-2.0.so.0 frame-filters:
  No frame filters registered.
objfile /usr/lib/debug/lib64/libpthread-2.16.so.debug frame-filters:
  No frame filters registered.
objfile /lib64/libpthread.so.0 frame-filters:
  No frame filters registered.
objfile /usr/lib/debug/lib64/librt-2.16.so.debug frame-filters:
  No frame filters registered.
objfile /lib64/librt.so.1 frame-filters:
  No frame filters registered.
objfile /usr/lib/debug/usr/lib64/libffi.so.5.0.10.debug frame-filters:
  No frame filters registered.
objfile /lib64/libffi.so.5 frame-filters:
  No frame filters registered.

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