adding an argument for test execution in testsuite

[Nenad Vukicevic]

Is it possible to add an argument to the test in the
execution phase of the testsuite? I am looking into
some test cases where number of threads to run must
be provided on the invocation line of the test if not
specified during the test compilation. Something that
is similar to "dg-skip-if" syntax but would add a run-time
option if there is a match.

Thanks,
Nenad