Change the numbering of static ctors/dtors to be module based instead of being global. This fixes #210 by making sure that the static ctor always gets the same number, regardless of the order of the modules given at the command line.

module enum1;

void main()
{
    enum {
        HELLO,
        WORLD
    }

    assert(HELLO == 0);
    assert(WORLD == 1);
}