vm: fix mul and div instructions

docs/source/todo.rst

@@ -4,7 +4,6 @@ TODO
 For next release
 ^^^^^^^^^^^^^^^^
 - vm: implement float any, all, reverse, sort
-- vm: fix test fp calc result being 0
 - vm: get rid of intermediate floats.xxx() functions somehow, instead generate the float instructions directly?
 - pipe operator: allow non-unary function calls in the pipe that specify the other argument(s) in the calls.
 - allow "xxx" * constexpr  (where constexpr is not a number literal), now gives expression error not same type