[m-rev.] for review: optimize successive field updates

[Michael Day]

> Fix a problem reported by Michael Day. When a piece of code had several
> updates to the fields of a cell in a row, we were constructing all the
> intermediate versions of the cell. With this change, we now construct
> only the final one.

Great! When compiled with rotd-2005-01-11, Prince is spending around 10%
of its time performing field updates. It will be very interesting to do
some comparative benchmarking with the new compiler.

Michael

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