1.0.4.80: make ADJUST-ARRAY interrupt-safe

1.0.4.80: make ADJUST-ARRAY interrupt-safe

 * WITHOUT-INTERRUPTS while using the temp-vector that is also bound
   to the thread-local *ZAP-ARRAY-DATA-TEMP*, so that interrupt handlers
   calling ADJUST-ARRAY cannot stomp on the data.

   Also zero out the temp-vector immediately, and be a bit more sensible
   about filling it.

 * STABLE-SORT has been audited for interrupt-safety vrt. its cached
   temporary vector, and is already OK.

 * Squeeze a mighty 1050 words out of the core by using empty vectors
   for both of the above to start with.