RFR(M): 7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob

[Roland Westrelin]

>> But 2- can bring more opportunities to do 1- again.
> 
> Yes, but loop opts executed several times. Why you want to do everything during one iteration?

It can happen without loops, with imbricated ifs. Why would we want to have multiple loop opts passes in that case if we can do everything at once?
What is the benefit of doing this in build_loop_early() rather than in process_expensive_nodes?

Roland.