Fortran: Unlimited polymorphic intrinsic function arguments [PR84006]

2024-05-12  Paul Thomas  <pault@gcc.gnu.org>

gcc/fortran
	PR fortran/84006
	PR fortran/100027
	PR fortran/98534
	* iresolve.cc (gfc_resolve_transfer): Emit a TODO error for
	unlimited polymorphic mold.
	* trans-expr.cc (gfc_resize_class_size_with_len): Use the fold
	even if a block is not available in which to fix the result.
	(trans_class_assignment): Enable correct assignment of
	character expressions to unlimited polymorphic variables using
	lhs _len field and rse string_length.
	* trans-intrinsic.cc (gfc_conv_intrinsic_storage_size): Extract
	the class expression so that the unlimited polymorphic class
	expression can be used in gfc_resize_class_size_with_len to
	obtain the storage size for character payloads. Guard the use
	of GFC_DECL_SAVED_DESCRIPTOR by testing for DECL_LANG_SPECIFIC
	to prevent the ICE. Also, invert the order to use the class
	expression extracted from the argument.
	(gfc_conv_intrinsic_transfer): In same way as 'storage_size',
	use the _len field to obtaining the correct length for arg 1.
	Add a branch for the element size in bytes of class expressions
	with provision to make use of the unlimited polymorphic _len
	field. Again, the class references are explicitly identified.
	'mold_expr' was already declared. Use it instead of 'arg'. Do
	not fix 'dest_word_len' for deferred character sources because
	reallocation on assign makes use of it before it is assigned.

gcc/testsuite/
	PR fortran/84006
	PR fortran/100027
	* gfortran.dg/storage_size_7.f90: New test.

	PR fortran/98534
	* gfortran.dg/transfer_class_4.f90: New test.

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