Use positional parameters in calls to .format in gdb python scripts (#9292) #9311
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Fixes #9292.
Omitting positional parameters works for gdb linked to python 2.7 / 3.1+. On older systems (e.g. redhat 6, centos 6) gdb might be linked to python 2.4-2.6 or 3.0, adding parameter ordinals enables proper backtraces on those systems.