vim-patch:9.0.0804: crash when trying to divide a number by -1

Problem:    Crash when trying to divice the largest negative number by -1.
Solution:   Handle this case specifically.
cdef1cefa2

src/nvim/eval.c

@@ -330,6 +330,10 @@ varnumber_T num_divide(varnumber_T n1, varnumber_T n2)
     } else {
       result = VARNUMBER_MAX;
     }
+  } else if (n1 == VARNUMBER_MIN && n2 == -1) {
+    // specific case: trying to do VARNUMBAR_MIN / -1 results in a positive
+    // number that doesn't fit in varnumber_T and causes an FPE
+    result = VARNUMBER_MAX;
   } else {
     result = n1 / n2;
   }