Backed out changeset [369996c08420]. The argument and order dependent numbering of static ctors/dtors generally doesn't matter because other modules shouldn't reference their symbols. The next changeset will fix a LDC bug that caused such references within ModuleInfo.

module union1;

union U
{
    float f;
    int i;
}

void main()
{
    float f = 2;
    U u = U(f);
    assert(u.i == *cast(int*)&f);
}