Preserve data between parallel region

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Proposed by Marco Danelutto @ HeteroPar 2010

Maybe add a new construct to preserve data on device between parallel regions, 
example:


#pragma omp parallel .... preserve
{
...
}

.... whatever ....

#pragma omp parallel .... 
{
....
}


To implement:

- New clause: preserve
- New conditional on parallel region template:

    {% if not omp_clause.preserve %}
       cudaDelete(....)
    {% endif %}

Original issue reported on code.google.com by namiurtf on 30 Aug 2010 at 10:36