fortran: OpenMP/OpenACC array mapping alignment fix (PR90030)

fortran: OpenMP/OpenACC array mapping alignment fix (PR90030)

Fix issue with the Fortran front-end when mapping arrays: when creating the
data MEM_REF for the map clause, there was a convention of casting the
referencing pointer to 'c_char *' by
fold_convert (build_pointer_type (char_type_node), ptr).

This causes the alignment passed to the libgomp runtime for array data
hardwared to '1', and causes alignment errors on the offload target.

This patch fixes this by removing the char_type_node pointer converts, and
adding gcc_asserts to ensure POINTER_TYPE_P (TREE_TYPE (ptr)).

	PR fortran/90030

gcc/fortran/ChangeLog:

	* trans-openmp.c (gfc_omp_finish_clause): Remove fold_convert to pointer
	to char_type_node, add gcc_assert of POINTER_TYPE_P.
	(gfc_trans_omp_array_section): Likewise.
	(gfc_trans_omp_clauses): Likewise.

gcc/testsuite/ChangeLog:

	* gfortran.dg/goacc/finalize-1.f: Adjust scan test.
	* gfortran.dg/gomp/affinity-clause-1.f90: Likewise.
	* gfortran.dg/gomp/affinity-clause-5.f90: Likewise.
	* gfortran.dg/gomp/defaultmap-4.f90: Likewise.
	* gfortran.dg/gomp/defaultmap-5.f90: Likewise.
	* gfortran.dg/gomp/defaultmap-6.f90: Likewise.
	* gfortran.dg/gomp/map-3.f90: Likewise.
	* gfortran.dg/gomp/pr78260-2.f90: Likewise.
	* gfortran.dg/gomp/pr78260-3.f90: Likewise.

libgomp/ChangeLog:

	* testsuite/libgomp.oacc-fortran/pr90030.f90: New test.
	* testsuite/libgomp.fortran/pr90030.f90: New test.

(cherry picked from commit 1ac7a8c9e4798d352eb8c64905dd38086af4e1cd)