perf probe: Accept FUNC@* to specify function name explicitly

In Golang, the function name will have the '.', and 'perf probe'
misinterprets it as a file name.

To mitigate this situation, introduce `function@*` so that user can
explicitly specify that it is a function name.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Alexander Lobakin <aleksander.lobakin@intel.com>
Cc: Dima Kogan <dima@secretsauce.net>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Link: https://lore.kernel.org/r/173099115149.2431889.13682110856853358354.stgit@mhiramat.roam.corp.google.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>