Force initialize the runtime module in Module::genLLVMModule. It is required for all non-trivial D modules anyway, so why load it lazily? This fixes run/typeid_83.d (DtoDeclareTypeInfo expects runtime to be initialized)

module bug56;

void main()
{
    int[] a;
    a = [1,2,3];
    {int[] b = [4,5,6];}
}