Misc cleanups here and there
    
    While looking at something else, the usual cleanup spree came up.
    
    	* src/abg-dwarf-reader.cc (canonicalize_types_scheduled): Fix
    	identation.
    	* src/abg-reader.cc (build_class_decl): Use class_decl_sptr rather
    	than shared_ptr<class_decl>.
    	* src/abg-writer.cc (write_class_is_declaration_only)
    	(write_is_struct, write_decl, write_decl_in_scope)
    	(write_type_decl, write_qualified_type_def)
    	(write_pointer_type_def, write_reference_type_def)
    	(write_array_type_def, write_enum_type_decl, write_typedef_decl)
    	(write_elf_symbol, write_var_decl, write_function_decl)
    	(write_member_type_opening_tag, write_member_type)
    	(write_class_decl_opening_tag, write_class_decl): Cleanup
    	parameters to use the right typedef, rather than the long
    	shared_ptr<*> form.  Pass the shared pointers by reference as
    	well.
    
    Signed-off-by: Dodji Seketeli <dodji@redhat.com>