openmp, fortran: Add iterator support for Fortran deep-mapping of allocatables

gcc/fortran/

	* trans-openmp.cc (gfc_omp_deep_mapping_map): Remove const from ctx
	argument.  Add arguments for iterators and the statement sequence to
	go into the iterator loop.  Add statement sequence to iterator loop
	body.  Generate iterator loop entries for generated maps, insert
	the map decls and sizes into the iterator element arrays, replace
	original decls with the address of the element arrays, and
	sizes/biases with SIZE_INT.
	(gfc_omp_deep_mapping_comps): Remove const from ctx. Add argument for
	iterators.  Pass iterators to calls to gfc_omp_deep_mapping_item and
	gfc_omp_deep_mapping_comps.
	(gfc_omp_deep_mapping_item): Remove const from ctx. Add argument for
	iterators.  Collect generated side-effect statements and pass to
	gfc_omp_deep_mapping_map along with the iterators.  Pass iterators
	to gfc_omp_deep_mapping_comps.
	(gfc_omp_deep_mapping_do): Remove const from ctx.  Pass iterators to
	gfc_omp_deep_mapping_item.
	(gfc_omp_deep_mapping_cnt): Remove const from ctx.
	(gfc_omp_deep_mapping): Likewise.
	* trans.h (gfc_omp_deep_mapping_cnt): Likewise.
	(gfc_omp_deep_mapping): Likewise.

gcc/

	* gimplify.cc (enter_omp_iterator_loop_context): New function variant.
	(enter_omp_iterator_loop_context): Delegate to new variant.
	(exit_omp_iterator_loop_context): New function variant.
	(exit_omp_iterator_loop_context): Delegate to new variant.
	(assign_to_iterator_elems_array): New.
	(add_new_omp_iterators_entry): New.
	(add_new_omp_iterators_clause): Delegate to
	add_new_omp_iterators_entry.
	* gimplify.h (enter_omp_iterator_loop_context): New prototype.
	(enter_omp_iterator_loop_context): Remove default argument.
	(exit_omp_iterator_loop_context): Remove argument.
	(assign_to_iterator_elems_array): New prototype.
	(add_new_omp_iterators_entry): New prototype.
	(add_new_omp_iterators_clause): New prototype.
	* langhooks-def.h (lhd_omp_deep_mapping_cnt): Remove const from
	argument.
	(lhd_omp_deep_mapping): Likewise.
	* langhooks.cc (lhd_omp_deep_mapping_cnt): Likewise.
	(lhd_omp_deep_mapping): Likewise.
	* langhooks.h (omp_deep_mapping_cnt): Likewise.
	(omp_deep_mapping): Likewise.
	* omp-low.cc (lower_omp_map_iterator_expr): Delegate to
	assign_to_iterator_elems_array.
	(lower_omp_map_iterator_size): Likewise.
	(lower_omp_target): Remove sorry for deep mapping.

libgomp/

	* testsuite/libgomp.fortran/allocatable-comp-iterators.f90: New.

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