passcount [n [num]]
passcount command sets the
passcount of the most recently defined tracepoint.  If no passcount is
given, the trace experiment will run until stopped explicitly by the
user.
Examples:
(gdb) passcount 5 2 // Stop on the 5th execution of 
                                   // tracepoint 2
(gdb) passcount 12  // Stop on the 12th execution of the
                                   // most recently defined tracepoint.
(gdb) trace foo
(gdb) pass 3
(gdb) trace bar
(gdb) pass 2
(gdb) trace baz
(gdb) pass 1        // Stop tracing when foo has been
                                    // executed 3 times OR when bar has
                                    // been executed 2 times
                                    // OR when baz has been executed 1 time.
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