* genrecog.c (special_mode_pred_table): New.
        (NUM_SPECIAL_MODE_PREDS): New.
        (find_operand): New.
        (validate_pattern): New argument `insn'.  Warn for assignment to
        any predicate accepting non-lvalues.  Conditionaly warn for
        match_operand without a mode.  Try much harder to match source
        and destination modes on a set.
        * tm.texi (SPECIAL_MODE_PREDICATES): Document.

From-SVN: r29967