The following tasks have been suggested for cleaning up the JTAG layer:
- use tap_set_state everywhere to allow logging TAP state transitions
-- rename other tap_states to use standard JTAG names (suggested by ML)
- Encapsulate cmd_queue_cur_state and related varaible handling.
- add slick 32 bit versions of jtag_add_xxx_scan() that avoids
buf_set_u32() calls and other evidence of poor impedance match between