better handling of unknown operands

[Frank Ch. Eigler]

Hi -

:   Ben> More generally, shouldn't cgen complain about any operand that appears
:   Ben> in the syntax string but not the field format list, or
:   Ben> vice-versa?
: 
: I haven't heard any comments on this [...]

It's not quite like that -- keep in mind ifields that embody padding or
reserved bits, and need no mentino in the syntax string.

- FChE
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