Non-contiguous array support patches [PR76739]

This is based on OG14 commit b143c1c447945ce05903ff1360ead97774dfce4b,
which was based from v4, posted upstream here:
https://gcc.gnu.org/pipermail/gcc-patches/2020-April/543437.html

It also incorporates a number of follow-up bug and bit-rot fixes, OG14
commits
e11726d3467543de45448097dde27ba34bf04bfe
87ea4de1c4a360d5d62357491a41811213f4528c
151fc161d0ed640048444ca18f9325e3d2e03e99
628a000bdbf63252c2ede13ccab8e99a19769866
11263c048d39ab1d6a11067b18674bf8307bbbf5
8c1068bbe3e52529bede5466a43af8d98f38dac2

gcc/c/ChangeLog
	PR other/76739
	* c-typeck.cc (handle_omp_array_sections_1): Add 'bool &non_contiguous'
	parameter, adjust recursive call site, add cases for allowing
	pointer based multi-dimensional arrays for OpenACC.  Reject
	non-DECL base-pointer cases as unsupported.
	(handle_omp_array_sections): Adjust handle_omp_array_sections_1 call,
	handle non-contiguous case to create dynamic array map.

gcc/cp/ChangeLog
	PR other/76739
	* semantics.cc (handle_omp_array_sections_1): Add 'bool &non_contiguous'
	parameter, adjust recursive call site, add cases for allowing
	pointer based multi-dimensional arrays for OpenACC.  Reject
	non-DECL base-pointer cases as unsupported.
	(handle_omp_array_sections): Adjust handle_omp_array_sections_1 call,
	handle non-contiguous case to create dynamic array map.

gcc/fortran/ChangeLog
	PR other/76739
	* f95-lang.cc (DEF_FUNCTION_TYPE_VAR_5): New symbol.
	* types.def (BT_FN_VOID_INT_SIZE_PTR_PTR_PTR_VAR): New type.

gcc/ChangeLog
	PR other/76739
	* builtin-types.def (BT_FN_VOID_INT_SIZE_PTR_PTR_PTR_VAR): New type.
	* gimplify.cc (omp_group_base): Handle GOMP_MAP_NONCONTIG_ARRAY_*.
	(gimplify_scan_omp_clauses): Handle OMP_TARGET_UPDATE.
	(gimplify_adjust_omp_clauses): Skip gimplification of
	OMP_CLAUSE_SIZE of non-contiguous array maps (which is a TREE_LIST).
	* omp-builtins.def (BUILT_IN_GOACC_DATA_START): Adjust function type
	to new BT_FN_VOID_INT_SIZE_PTR_PTR_PTR_VAR.
	* omp-expand.cc (expand_omp_target): Add non-contiguous array
	descriptor pointers to variadic arguments.
	* omp-low.cc (append_field_to_record_type): New function.
	(create_noncontig_array_descr_type): Likewise.
	(create_noncontig_array_descr_init_code): Likewise.
	(scan_sharing_clauses): For non-contiguous array map kinds, check for
	supported dimension structure, and install non-contiguous array
	variable into current omp_context.
	(reorder_noncontig_array_clauses): New function.
	(scan_omp_target): Call reorder_noncontig_array_clauses to place
	non-contiguous array map clauses at beginning of clause sequence.
	(lower_omp_target): Add handling for non-contiguous array map kinds,
	add all created non-contiguous array descriptors to
	gimple_omp_target_data_arg.
	* tree-pretty-print.cc (dump_omp_clause): Handle
	GOMP_MAP_NONCONTIG_ARRAY_*.

gcc/testsuite/ChangeLog
	PR other/76739
	* c-c++-common/goacc/data-clause-1.c (foo): Remove expected message.
	* c-c++-common/goacc/noncontig_array-1.c: New test.
	* g++.dg/goacc/data-clause-1.C (foo): Remove expected message.

include/ChangeLog
	PR other/76739
	* gomp-constants.h (GOMP_MAP_FLAG_SPECIAL_3): Define.
	(enum gomp_map_kind): Add GOMP_MAP_NONCONTIG_ARRAY,
	GOMP_MAP_NONCONTIG_ARRAY_TO, GOMP_MAP_NONCONTIG_ARRAY_FROM,
	GOMP_MAP_NONCONTIG_ARRAY_TOFROM, GOMP_MAP_NONCONTIG_ARRAY_FORCE_TO,
	GOMP_MAP_NONCONTIG_ARRAY_FORCE_FROM,
	GOMP_MAP_NONCONTIG_ARRAY_FORCE_TOFROM,
	GOMP_MAP_NONCONTIG_ARRAY_ALLOC, GOMP_MAP_NONCONTIG_ARRAY_FORCE_ALLOC,
	GOMP_MAP_NONCONTIG_ARRAY_FORCE_PRESENT.
	(GOMP_MAP_NONCONTIG_ARRAY_P): Define.

libgomp/ChangeLog
	PR other/76739
	* libgomp.h (gomp_map_vars_openacc): New function declaration.
	* libgomp_g.h (GOACC_data_start): Add variadic '...' to declaration.
	* oacc-int.h (struct goacc_ncarray_dim): New struct declaration.
	(struct goacc_ncarray_descr_type): Likewise.
	(struct goacc_ncarray): Likewise.
	(struct goacc_ncarray_info): Likewise.
	(goacc_noncontig_array_create_ptrblock): New function declaration.
	* oacc-parallel.c (goacc_noncontig_array_count_rows): New function.
	(goacc_noncontig_array_compute_sizes): Likewise.
	(goacc_noncontig_array_fill_rows_1): Likewise.
	(goacc_noncontig_array_fill_rows): Likewise.
	(goacc_process_noncontiguous_arrays): Likewise.
	(goacc_noncontig_array_create_ptrblock): Likewise.
	(GOACC_parallel_keyed): Use goacc_process_noncontiguous_arrays to
	handle non-contiguous array descriptors at end of varargs, adjust
	to use gomp_map_vars_openacc.
	(GOACC_data_start): Likewise. Adjust function type to accept varargs.
	* target.c (gomp_map_vars_internal): Add struct goacc_ncarray_info *
	nca_info parameter, add handling code for non-contiguous arrays.
	(gomp_map_vars_openacc): Add new function for specialization of
	gomp_map_vars_internal for OpenACC structured region usage.
	* testsuite/libgomp.oacc-c-c++-common/noncontig_array-1.c: New test.
	* testsuite/libgomp.oacc-c-c++-common/noncontig_array-2.c: New test.
	* testsuite/libgomp.oacc-c-c++-common/noncontig_array-3.c: New test.
	* testsuite/libgomp.oacc-c-c++-common/noncontig_array-4.c: New test.
	* testsuite/libgomp.oacc-c-c++-common/noncontig_array-utils.h: Support
	header for new tests.

Co-Authored-By: Kwok Cheung Yeung <kcy@codesourcery.com>
Co-Authored-By: Paul-Antoine Arras <parras@baylibre.com>

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