Implement comments from review.

This implements the comments from the review - the general prefix is now
cas (for coarray shared), and native has been renamed to shared generally.
Plus, there is a lot of cleanup such as removing dead code and
debug statements.

gcc/ChangeLog:

	PR fortran/88076
	* flag-types.h (enum gfc_fcoarray): Change GFC_FCOARRAY_NATIVE to
	GFC_FCOARRAY_SHARED.

gcc/fortran/ChangeLog:

	PR fortran/88076
	* dump-parse-tree.c (show_symbol): Remove dumping of backend_decl.
	* frontend-passes.c (gfc_run_passes): Generally rename "native" to
	"shared" and "cas" instead of "nca".
	(co_reduce_code): Initialize num.  Generally rename "native" to
	"shared" and "cas" instead of "nca".
	* gfortran.h: Generally rename "native" to "shared".
	* iresolve.c (gfc_resolve_co_collective): Use specific function
	for library coarrays. Generally rename "native" to "shared" and
	"cas" instead of "nca".
	(gfc_resolve_co_reduce): Generally rename "native" to "shared" and
	"cas" instead of "nca".
	(gfc_resolve_co_broadcast): Generally rename "native" to "shared"
	and "cas" instead of "nca".
	* lang.opt: Generally rename "native" to "shared" and "cas"
	instead of "nca".
	* resolve.c (fixup_coarray_args): Rename to
	(fixup_shared_coarray_args): Generally rename "native" to
	"shared" and "cas" instead of "nca".  Get rid of a variable.
	(resolve_unknown_s): Fix whitespace.
	(resolve_call): Generally rename "native" to "shared" and "cas"
	instead of "nca".
	(resolve_critical): Revert spurious change. Generally rename
	"native" to "shared" and "cas" instead of "nca".
	* trans-array.c (gfc_add_strides): Fix comment format.
	(gfc_native_coarray_add_this_image_offset): Generally rename
	"native" to "shared" and "cas" instead of "nca". Formatting
	fixes.
	(gfc_conv_ss_descriptor): Generally rename "native" to "shared"
	and "cas" instead of "nca".
	(build_array_ref): Remove empty line.
	(gfc_conv_array_ref): Generally rename "native" to "shared" and
	"cas" instead of "nca".
	(gfc_array_init_size): Special-case GFC_COARRAY_SHARED. Generally
	rename "native" to "shared" and "cas" instead of "nca".  Fix
	formatting.
	(gfc_allocate_native_coarray): Generally rename "native" to
	"shared" and "cas" instead of "nca".
	(gfc_array_allocate): Generally rename "native" to "shared" and
	"cas" instead of "nca". Fix comment syntax.
	(gfc_trans_dummy_array_bias): Generally rename "native" to
	"shared" and "cas" instead of "nca".
	(gfc_get_dataptr_offset): Generally rename "native" to "shared"
	and "cas" instead of "nca". Fix comment style.
	(gfc_conv_expr_descriptor): Remove code blocks guarded by #if 0 or #if 1.
	(gfc_conv_array_parameter): Likewise.
	(gfc_walk_array_ref): Likewise.
	* trans-array.h (enum gfc_coarray_allocation_type): Change offset from 3 to 1.
	* trans-decl.c: Generally rename "native" to "shared" and "cas"
	instead of "nca" for tree declarations.
	(gfc_build_qualified_array): Generally rename "native" to "shared"
	and "cas" instead of "nca".
	(gfc_build_dummy_array_decl): Generally rename "native" to "shared"
	and "cas" instead of "nca".
	(gfc_get_symbol_decl): Revert spurious change. Generally rename
	"native" to "shared" and "cas" instead of "nca".
	(gfc_build_builtin_function_decls): Generally rename "native" to
	"shared" and "cas" instead of "nca".
	(gfc_trans_native_coarray): Clarify comment. Generally rename
	"native" to "shared" and "cas" instead of "nca".
	(gfc_trans_deferred_vars): Generally rename "native" to "shared"
	and "cas" instead of "nca".
	(gfc_create_module_variable): Generally rename "native" to
	"shared" and "cas" instead of "nca".
	(generate_coarray_constructor_function): Generally rename "native"
	to "shared" and "cas" instead of "nca".
	(create_main_function): Generally rename "native" to "shared"
	and "cas" instead of "nca".
	* trans-expr.c (gfc_maybe_dereference_var): Remove branch where
	condition is always false. Generally rename "native" to "shared"
	and "cas" instead of "nca".
	(gfc_conv_procedure_call): Remove code blocks guarded by #if 0.
	Whitespace fix.
	* trans-intrinsic.c (trans_this_image): Generally rename "native"
	to "shared" and "cas" instead of "nca".
	(trans_image_index): Remove unneeded TODO. Generally rename
	"native" to "shared" and "cas" instead of "nca".
	(trans_num_images): Generally rename "native" to "shared" and
	"cas" instead of "nca".
	(conv_intrinsic_cobound): Generally rename "native" to "shared"
	and "cas" instead of "nca".
	(trans_argument): Clarify comment explaining what the function does.
	(conv_nca_reduce): Rename to...
	(conv_cas_reduce): this. Add comment.
	(conv_nca_broadcast): Rename to...
	(conv_cas_broadcast): this.
	(conv_nca_collective): Rename to...
	(conv_cas_collective): this.
	(conv_co_collective): Generally rename "native" to "shared" and
	"cas" instead of "nca".
	(gfc_conv_intrinsic_subroutine): Generally rename "native" to
	"shared" and "cas" instead of "nca".
	* trans-stmt.c (gfc_trans_lock_unlock): Generally rename "native"
	to "shared" and "cas" instead of "nca".
	(gfc_trans_sync): Generally rename "native" to "shared" and "cas"
	instead of "nca".
	(gfc_trans_critical): Generally rename "native" to "shared" and
	"cas" instead of "nca".
	(gfc_trans_deallocate): Generally rename "native" to "shared" and
	"cas" instead of "nca".
	* trans-types.c (gfc_is_nodesc_array): Generally rename "native"
	to "shared" and "cas" instead of "nca".
	(gfc_build_array_type): Generally rename "native" to "shared" and
	"cas" instead of "nca".
	(gfc_get_nodesc_array_type): Generally rename "native" to "shared"
	and "cas" instead of "nca".
	(gfc_get_array_type_bounds): Generally rename "native" to "shared"
	and "cas" instead of "nca".
	* trans.c (gfc_trans_memory_barrier): Use sizeof instead of strlen,
	replace comma by semicolon.
	(gfc_build_array_ref): Generally rename "native" to "shared" and
	"cas" instead of "nca".
	(gfc_deallocate_with_status): Fix indentation. Generally rename
	"native" to "shared" and "cas" instead of "nca".
	* trans.h: Generally rename "native" to "shared" and "cas" instead
	of "nca".

libgfortran/ChangeLog:

	PR fortran/88076
	* m4/nca-minmax-s.m4: Change "nca" prefix to "cas".  Add comments.
	* m4/nca_minmax.m4: Likewise.
	* nca/README.native_coarrays: Update.
	* nca/alloc.c (free_memory_with_id): Add FIXME.
	* nca/coarraynative.c (nca_master): Rename to
	(cas_master): Change logic for exiting images.
	* nca/collective_subroutine.c (get_collsub_buf): Add comment.
	(collsub_sync): Remove dead debug output.
	(collsub_reduce_array): Silence -Wsign-compare warning.
	(collsub_iface_init): Remove unused variable.
	(collsub_broadcast_scalar): Remove debug code.
	(collsub_broadcast_array): Remove unused variable.
	(nca_co_broadcast): Remove commented-out function, plus its
	(export_proto): prototype declaration.
	* nca/collective_subroutine.h (finish_collective_subroutine): Add.
	* nca/hashmap.c (num_entries): Silcence -Wsign-compare warning.
	(hash): Formatting change (add empty lines).
	(gen_mask): Likewise.
	(hmiadd): Likewise.
	(get_expected_offset): Likewise.
	(hashmap_init): Likewise.
	(scan_empty): Likewise. Remove unused argument.
	(hashmap_get): Formatting change (add empty lines).
	(hm_search_result_ptr): Likewise.
	(hm_search_result_contains): Likewise.
	(enlarge_hashmap_mem): Likewise.
	(resize_hm): Likewise. Remove argument in call to scan_empty.
	(hashmap_set): Remove dead debugging code. Silence -Wsign-compare
	warning.
	(hashmap_change_refcnt):  Silence -Wsign-compare warning.
	(hashmap_inc): Formatting change.
	* nca/hashmap.h (Library): Add copyright notice.
	* nca/libcoarraynative.h (DEBUG_NATIVE_COARRAY): #define as 0
	(NUM_ADDR_BITS): Remove dead code.
	(nca_master): Rename to
	(cas_master): this.
	* nca/shared_memory.c (shared_memory_get_mem_with_alignment):
	Remove debug code.
	* nca/shared_memory.h (SHARED_MEMORY_H): Move definition to start
	of file.
	* nca/sync.c (get_locked_table):  Remove commented-out code.
	(sync_iface_init): Remove debug code.
	(sync_all): Remove debug code.
	* nca/sync.h: Add space after #include.
	* nca/util.c: Include assert.h. Add comment.
	(next_power_of_two): Remove comment.
	(pack_array_finish): Replace 0 by '\0' in memset.
	(unpack_array_finish): Zero variable count.
	* nca/wrapper.c (enum gfc_coarray_allocation_type): Enum starts at
	one.  Add comment about need to keep in sync with trans-array.h.
	(nca_coarray_alloc): Rename to
	(cas_coarray_alloc): this.
	(nca_coarray_free): Rename to
	(cas_coarray_free): this.
	(nca_coarray_this_image): Rename to
	(cas_coarray_this_image): this.
	(nca_coarray_num_images): Rename to
	(cas_coarray_num_images): this.
	(nca_coarray_sync_all): Rename to
	(cas_coarray_sync_all): this.
	(nca_sync_images): Rename to
	(cas_sync_images): this.
	(nca_lock): Rename to
	(cas_lock): this.
	(nca_unlock): Rename to
	(cas_unlock): this.
	(nca_collsub_reduce_array): Rename to
	(cas_collsub_reduce_array): this.
	(nca_collsub_reduce_scalar): Rename to
	(cas_collsub_reduce_scalar): this.
	(nca_collsub_broadcast_array): Rename to
	(cas_collsub_broadcast_array): this.
	(nca_collsub_broadcast_scalar): Rename to
	(cas_collsub_broadcast_scalar): this.
	* nca/.tags: Delete.
	* nca/collective_inline.h: Delete.
	* generated/nca_minmax_i1.c: Regenerated.
	* generated/nca_minmax_i16.c: Regenerated.
	* generated/nca_minmax_i2.c: Regenerated.
	* generated/nca_minmax_i4.c: Regenerated.
	* generated/nca_minmax_i8.c: Regenerated.
	* generated/nca_minmax_r10.c: Regenerated.
	* generated/nca_minmax_r16.c: Regenerated.
	* generated/nca_minmax_r4.c: Regenerated.
	* generated/nca_minmax_r8.c: Regenerated.
	* generated/nca_minmax_s1.c: Regenerated.
	* generated/nca_minmax_s4.c: Regenerated.

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