RFR: Improve AryEq

[Roman Kennke]

Am Dienstag, den 20.12.2016, 12:15 +0100 schrieb Aleksey Shipilev:
> On 12/20/2016 12:10 PM, Roman Kennke wrote:
> > This adds an cmp-barrier to the code generated by AryEq. A false
> > negative in the array ptr comparison would result in the slow-path
> > being taken, even though it's not necessary. The barrier should get
> > us
> > on the fast path more often.
> > 
> > Ok?
> > 
> > http://cr.openjdk.java.net/~rkennke/aryeq/webrev.00/
> 
> Looks okay, but would be interesting to see if we can merge null-
> checking paths
> with acmp barrier?

That would be complicated. Would need build special code just for this
intrinsics... Doesn't seem worth for now. I'm pushing as is.

Roman