1.0.8.44: Fix EQUALP on structures with raw slots

1.0.8.44: Fix EQUALP on structures with raw slots

         * Old version was basically accessing raw slots with %INSTANCE-REF,
           and doing EQUALP on the results. This was most obviously wrong
           for raw slots that were larger than a word (double-floats on 32-bit
           platforms). Less obviously this is also wrong for some float
           corner-cases, like negative zeroes.
         * Add RAW-INSTANCE-SLOTS-EQUALP which instead grovels the layout for
           the slot definitions and determines the proper accessor functions
           for each slot from that.
         * Reported by Vjacheslav Fyodorov.