perf trace beauty clone: Handle CLONE_PIDFD

In addition to the older flags. This will allow something like this to
be implemented in 'perf trace"

  perf trace -e clone/PIDFD in flags/

I.e. ask for strace like tracing, system wide, looking for 'clone'
syscalls that have the CLONE_PIDFD bit set in the 'flags' arg.

For now we'll just see PIDFD if it is set in the 'flags' arg.

Cc: Christian Brauner <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Brendan Gregg <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Luis Cláudio Gonçalves <[email protected]>
Cc: Namhyung Kim <[email protected]>
Link: https://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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