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.

void main()
{
    int[4] a = [1,2,3,4];
    int[4] b = [5,6,7,8];
    a[] += b[];
    assert(a[0] == 6);
    assert(a[1] == 8);
    assert(a[2] == 10);
    assert(a[3] == 12);
}