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current buffer to read.  Callers changed.
When specified, narrow to this region only when reading,
not during eval.  Track next point to read from during eval.
Also restore point to "real" buffer position before eval.
(Feval_region): Don't save excursion and restriction here, and
don't narrow to region.  Just pass region to readevalloop.
Note: Point is now preserved even when PRINTFLAG is nil.