[aarch64-port-dev ] RFR 8233339: Shenandoah: Centralize load barrier decisions into ShenandoahBarrierSet

[Zhengyu Gu]

>>
>> I would like to centralize the decision making into
>> ShenandoahBarrierSet, so them can be consistent and easy to maintain.
> 
> You should say, at the start of every routine you touch, which
> registers are inputs, which are outputs, and (important) which may
> alias with rscratch1 and rscratch2. Please also mark clobbers of
> rscratch1 and 2.
> 
Okay, updated:

Webrev: http://cr.openjdk.java.net/~zgu/JDK-8233339/webrev.01/index.html

Thanks,

-Zhengyu