openmp, fortran: Add support for non-constant iterator bounds in Fortran deep-mapping iterator support

gcc/fortran/

	* trans-openmp.cc (gfc_omp_deep_mapping_map): Add new argument for
	vector of newly created iterators.  Push new iterators onto the
	vector.
	(gfc_omp_deep_mapping_comps): Add new argument for vector of new
	iterators.  Pass argument in calls to gfc_omp_deep_mapping_item and
	gfc_omp_deep_mapping_comps.
	(gfc_omp_deep_mapping_item): Add new argument for vector of new
	iterators.  Pass argument in calls to gfc_omp_deep_mapping_map and
	gfc_omp_deep_mapping_comps.
	(gfc_omp_deep_mapping_do): Add new argument for vector of new
	iterators.  Pass argument in calls to gfc_omp_deep_mapping_item.
	(gfc_omp_deep_mapping_cnt): Pass NULL to new argument for
	gfc_omp_deep_mapping_do.
	(gfc_omp_deep_mapping): Add new argument for vector of new
	iterators.  Pass argument in calls to gfc_omp_deep_mapping_do.
	* trans.h (gfc_omp_deep_mapping): Add new argument.

gcc/

	* langhooks-def.h (lhd_omp_deep_mapping): Add new argument.
	* langhooks.cc (lhd_omp_deep_mapping): Likewise.
	* langhooks.h (omp_deep_mapping): Likewise.
	* omp-low.cc (allocate_omp_iterator_elems): Work on the supplied
	iterator set instead of the iterators in a supplied set of clauses.
	(free_omp_iterator_elems): Likewise.
	(lower_omp_target): Maintain vector of new iterators generated by
	deep-mapping.  Allocate and free iterator element arrays using
	iterators found in clauses and in the new iterator vector.

libgomp/

	* testsuite/libgomp.fortran/allocatable-comp-iterators.f90: Add test
	for non-const iterator boundaries.

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