[OpenMP, Patch] PR fortran/47886 fix ICE in OMP task's if() clause

[Tobias Burnus]

The patch is rather obvious. Without, one gets an ICE as the function is 
not resolved but BT_UNKNOWN in

    !$omp task if(omp_get_num_threads()>  0)


Build and regtested on x86-64-linux.
OK for the trunk? What about GCC 4.4 and 4.5?

Tobias

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