It died in favor of GDB XML target descriptions. Neither this
nor ugdb currently use one but gdbserver provides this feature - attached.
This target->GDB transferred XML info defines the target registers layout.
Ah! I hadn't realized that stuff superceded the built-in knowledge.
libebl already provides textual register names so I think it could be
into this GDB XML target description. (Some needed minor adjustments on top
of it can be discovered later.)
Indeed, a program to translate libebl's tables into the XML form that GDB
likes would be handy.