[patch, Fortran] Fix PR 50690

[Thomas Koenig]

Hello world,

here is a fix for PR 50690, pretty self-explanatory.  Regression-tested.
OK for trunk?

	Thomas


2011-10-15  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/50690
         * frontend-passes.c (omp_level):  New variable.
         (create_var):  If we are within an OMP block, put
         the variable in the enclosing namespace and set
         the threadprivate attribute.
         (optimize_namespace):  Initialize omp_level.
         (gfc_code_walker):  Keep track of omp level.

2011-10-15  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/50690
         * gfortran.dg/gomp/workshare2.f90:  New test.
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