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Avoid division by zero deaths in the compiler.

    Print an error instead of dying.

--- a/mi/fold.c

+++ b/mi/fold.c

@@ -152,6 +152,9 @@

                 r = val(n->loc, a * b, exprtype(n));

             break;

         case Odiv:

+            /* x/0 = error */

+            if (isval(args[1], 0))

+                fatal(args[1], "division by zero");

             /* x/1 = x */

             if (isval(args[1], 1))

                 r = args[0];