Replace some rlet and slet uses with alet.

* share/txr/stdlib/place.tl (nthcdr): Fix a potentially
wrong order of evaluation by using a temporary symbol for the
list and using alet.  If the list form could potentially
modify the index, then we now avoid a bug here.
(vecref, chr-str, ref, gethash, slot): Optimise
the expansion of these two-expression places using alet.
If both expressions are symbols, which is often the case,
temporaries are avoided.

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