* gimple-walk.c (walk_gimple_op) <GIMPLE_OMP_FOR>: Also check
	intermediate walk_tree results for for_incr.
	<GIMPLE_OMP_TARGET>: Walk child_fn and data_arg, too.
	<GIMPLE_OMP_CRITICAL, GIMPLE_OMP_ATOMIC_STORE>: Pretty printing.

From-SVN: r218686