[m-rev.] for review: instmap_delta_restrict

[Zoltan Somogyi]

For review by anyone. I am mostly seeking feedback on
the names of the new library predicates, and whether they
should be in the documented part of the interface or not.
If yes, I intend to add an entry to NEWS with the final name.

Julien, if you have a server machine free, you may want to benchmark
this change. On my laptop, the difference is lost in thermal
throttling noise.

Zoltan.
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