CreateInfosFor(aList, first, last);
mCount += CreateInfosFor(aList, first, last);
nsInfoListImpl::Prepend(nsIFrame* aList){    nsCalculatedBoxInfo* first;    nsCalculatedBoxInfo* last;    CreateInfosFor(aList, first, last);    if (!mFirst)        mFirst = mLast = first;    else {        last->next = mFirst;        mFirst = first;    }}