Based on sollve_vv's tests/4.5/target_teams_distribute/test_target_teams_distribute_nowait.F90

As discussed, for simple pointers – like here with nondescriptor array,
instead of alloc:a + pointer assign, a firstprivate + pointer assign makes
more sense.

It also avoids the race exposed by the sollve_vv testcase in some constellations.
(The testcase, both as attached and currently in sollve_vv [→ Issue #532], is
invalid if run with 'nowait' as there is a race related to the array - as it
only (un)mapped as (disjunct) array sections via interleaved, concurrently
running target constructs with nowait clause.)

There might be more places where this should/could be done – and in principle,
firstprivate could also be useful for an array descriptor (but not its data);
this could also be explored. (Including whether it should then not be privatized
with shared memory.)

OK?

Tobias

PS: OpenACC is excluded as it does its own firstprivate handling.
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