Fix column information for omp_clauses in Fortran code

Fix column information for omp_clauses in Fortran code

The location of all OpenMP/OpenACC clauses on any given line in Fortran code
always points to the first clause on that line. Hence, the column information
is wrong for all clauses but the first one.

Use the correct location for each clause instead.

2019-12-09  Frederik Harwath  <frederik@codesourcery.com>

/gcc/fortran/
	* trans-openmp.c (gfc_trans_omp_reduction_list): Pass correct location for each
	clause to build_omp_clause.

From-SVN: r279132