Tidy type handling in binutils/rdcoff.c

Tidy type handling in binutils/rdcoff.c

There isn't really any good reason for code in rdcoff.c to distinguish
between "basic" types and any other type.  This patch dispenses with
the array reserved for basic types and instead handles all types using
coff_get_slot, simplifying the code.

	* rdcoff.c (struct coff_types, coff_slots): Merge.  Delete
	coff_slots.
	(T_MAX): Delete.
	(parse_coff_base_type): Use coff_get_slot to store baseic types.
	(coff_get_slot, parse_coff_type, parse_coff_base_type),
	(parse_coff_struct_type, parse_coff_enum_type),
	(parse_coff_symbol, parse_coff): Pass types as coff_types**.