RFR(M): 8154826: AArch64: take better advantage of base + shifted offset addressing mode

[Roland Westrelin]

Hi Martin,

> Roland, sorry that we discuss so much of my stuff in your thread for
> 8154826. I think it is slightly related to your change and it touches
> the same files. So it might be easier to sell it as add-on to your
> change?
> 
> If you prefer to handle it separated from 8154826, please let me
> know. I could open a new bug for it. Disadvantage would be that
> someone will have to take care of closed source platforms and I will
> need a sponsor from Oracle.

I would say it would be cleaner to keep the 2 changes separated (a
change that affects all platforms hidden in a platform specific one
might be confusing to someone looking at the history of changes). But I
don't really have a strong opinion either so I'll let those who would do
the extra sponsoring work decide. Vladimir, what do you think?

Roland.