punning the pcb to an array of ints and using magic indices to
access values in it. This should prevent silent breakage from
changes in the pcb.
Supply 0 for unavailable registers instead of punning the tss to
an array of ints and using magic indices to access garbage values
in it. (The registers are in the pcb; there is nothing interesting
in the tss. This should change someday. At least for dumps, all
the registers should be saved, and common_tss is a good place to
put them.)
Removed ancient wrong (disabled) method for reading eip.
