RFR(S): 8199784: PhaseIdealLoop::place_near_use() might return wrong control with loop strip mining

[Roland Westrelin]

> I am asking why not just do next?:
> +  if (u_loop->_child) {
> +    if (u_loop->_head->is_OuterStripMinedLoop()) {
> +      return u_loop->_head->in(LoopNode::EntryControl);

That would cover the case where the load is moved from inside the strip
mined counted loop to the outer loop, that is after the counted
loop end.

Roland.