OpenACC 'kernels' decomposition: Mark variables used in synthesized data clauses...

OpenACC 'kernels' decomposition: Mark variables used in synthesized data clauses as addressable [PR100280]

... as otherwise 'gcc/omp-low.c:lower_omp_target' has to create a temporary:

    13073			else if (is_gimple_reg (var))
    13074			  {
    13075			    gcc_assert (offloaded);
    13076			    tree avar = create_tmp_var (TREE_TYPE (var));
    13077			    mark_addressable (avar);

..., which (a) is only implemented for actualy *offloaded* regions (but not
data regions), and (b) the subsequently synthesized code for writing to and
later reading back from the temporary fundamentally conflicts with OpenACC
'async' (as used by OpenACC 'kernels' decomposition).  That's all not trivial
to make work, so let's just avoid this case.

	gcc/
	PR middle-end/100280
	* omp-oacc-kernels-decompose.cc (maybe_build_inner_data_region):
	Mark variables used in synthesized data clauses as addressable.
	gcc/testsuite/
	PR middle-end/100280
	* c-c++-common/goacc/kernels-decompose-pr100280-1.c: New.
	* c-c++-common/goacc/classify-kernels-parloops.c: Likewise.
	* c-c++-common/goacc/classify-kernels-unparallelized-parloops.c:
	Likewise.
	* c-c++-common/goacc/classify-kernels-unparallelized.c: Test
	'--param openacc-kernels=decompose'.
	* c-c++-common/goacc/classify-kernels.c: Likewise.
	* c-c++-common/goacc/kernels-decompose-2.c: Update.
	* c-c++-common/goacc/kernels-decompose-ice-1.c: Remove.
	* c-c++-common/goacc/kernels-decompose-ice-2.c: Likewise.
	* gfortran.dg/goacc/classify-kernels-parloops.f95: New.
	* gfortran.dg/goacc/classify-kernels-unparallelized-parloops.f95:
	Likewise.
	* gfortran.dg/goacc/classify-kernels-unparallelized.f95: Test
	'--param openacc-kernels=decompose'.
	* gfortran.dg/goacc/classify-kernels.f95: Likewise.
	libgomp/
	PR middle-end/100280
	* testsuite/libgomp.oacc-c-c++-common/declare-vla-kernels-decompose-ice-1.c:
	Update.
	* testsuite/libgomp.oacc-c-c++-common/f-asyncwait-1.c: Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-decompose-1.c:
	Likewise.

Suggested-by: Julian Brown <julian@codesourcery.com>