Generate less dead code by deleting unreachable blocks at the end of functions (which would otherwise appear if a function ends with a return, for example).

module complex3;

void main()
{
    cfloat c1 = 1f + 0i;
    cfloat c2 = 0f + 0i;
    c2 += 1f + 0i;
    assert(c1 == c2);
}