Fortran: Bugs found in class_transformational_1/2.f90[PR116254/118059].

2024-12-23  Paul Thomas  <pault@gcc.gnu.org>

gcc/fortran/ChangeLog

	PR fortran/116254
	* trans-array.cc (gfc_trans_create_temp_array): Make sure that
	transformational intrinsics of class objects that change rank,
	most particularly spread, go through the correct code path. Re-
	factor so that changes to the dtype are done on the temporary
	before the class data of the result points to it.

	PR fortran/118059
	* trans-expr.cc (arrayfunc_assign_needs_temporary): Character
	array function expressions assigned to an unlimited polymorphic
	variable require a temporary.