perf probe: Detect probe target when m/x options are absent

Options -m and -x explicitly allow tracing of modules / user space
binaries. In absense of these options, check if the first argument can
be used as a target.

perf probe /bin/zsh zfree is equivalent to perf probe -x /bin/zsh zfree.

Suggested-by: Arnaldo Carvalho de Melo <[email protected]>
Cc: Ananth N Mavinakayanahalli <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Anton Arapov <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jim Keniston <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Linux-mm <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Srikar Dronamraju <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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