* valprint.h (get_array_bounds): Change low and high parameter types

	* valprint.h (get_array_bounds): Change low and high parameter types
	to LONGEST *.
	* valprint.c (get_array_bounds): Use get_discrete_bounds call to
	compute bounds.
	(val_print_array_elements): Adapt to change above.
	* ada-valprint.c (print_optional_low_bound): Adapt to change above.
	* p-valprint.c (pascal_val_print): Likewise.