Revert 'OpenMP: Constructors and destructors for "declare target" static aggregates'

Revert 'OpenMP: Constructors and destructors for "declare target" static aggregates'

... in preparation of cherry-picking the upstream trunk changes.

This reverts commit 9127b4db9c58f48e0b47816d64e22c21404136b3.

	gcc/
	Revert:
	2023-05-12  Julian Brown  <julian@codesourcery.com>

	* omp-builtins.def (BUILT_IN_OMP_IS_INITIAL_DEVICE): New builtin.
	* tree.cc (get_file_function_name): Support names for on-target
	constructor/destructor functions.
	gcc/cp/
	Revert:
	2023-05-12  Julian Brown  <julian@codesourcery.com>

	* decl2.cc (tree-inline.h): Include.
	(static_init_fini_fns): Bump to four entries. Update comment.
	(start_objects, start_partial_init_fini_fn): Add 'omp_target'
	parameter. Support "declare target" decls. Update forward declaration.
	(emit_partial_init_fini_fn): Add 'host_fn' parameter. Return tree for
	the created function. Support "declare target".
	(OMP_SSDF_IDENTIFIER): New macro.
	(partition_vars_for_init_fini): Support partitioning "declare target"
	variables also.
	(generate_ctor_or_dtor_function): Add 'omp_target' parameter. Support
	"declare target" decls.
	(c_parse_final_cleanups): Support constructors/destructors on OpenMP
	offload targets.
	libgomp/
	Revert:
	2023-05-12  Julian Brown  <julian@codesourcery.com>

	* testsuite/libgomp.c++/static-aggr-constructor-destructor-1.C: New
	test.
	* testsuite/libgomp.c++/static-aggr-constructor-destructor-2.C: New
	test.
	* testsuite/libgomp.c++/static-aggr-constructor-destructor-3.C: New
	test.