(unw_dyn_info_format_t): New type.
(unw_dyn_op): Decrease "tag" from 16 to 8 bits, ditto for "qp" member.
(unw_dyn_proc_info): Change "name" pointer to "name_ptr" value (unw_word_t) and
make padding explicit.
(unw_dyn_table_info): Change "name" pointer to "name_ptr" value. Rename
"table_size" to "table_len" and change type of table_data from
void * to "unw_word_t *".
(unw_dyn_info): Switch to doubly-linked list so _U_dyn_cancel() can be O(1).
Change type of "format" member from enum to int32_t. Make padding explicit.
(unw_dyn_info_list): Make "generation" member 32 bits wide. Add "version" member
to enable future extensions to the dynamic info list.
(_U_dyn_register): Don't return anything (it can't fail).
(_U_dyn_cancel): Ditto.
(Logical change 1.30)
