[gomp4] correct a tile bug with combined loops in fortran

[Cesar Philippidis]

Nathan spotted a bug where the fortran FE wasn't lowering the tile
clause properly in combined parallel/kernels loops. The problem was that
gfc_trans_omp_d has two sources of clauses, code->ext.omp_clauses and
do_clauses. Because of the way that the fortran FE splits combined
loops, the tile clause is only associated with do_clauses. This patch
teaches gfc_trans_omp_do to check for the tile clause in both code and
do_clauses.

I've applied this patch to gomp-4_0-branch.

Cesar
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