[aarch64-port-dev ] [8u] RFR: Revert differences against upstream 8u

[Roman Kennke]

Looks good to me!

Thanks,
Roman


> Hi,
> 
> After Andrew's integration of 8u AArch64 port to 
> aarch64-port/jdk8u-shenandoah, I took our autogenerated webrev [1] that 
> is supposed to only include Shenandoah at this point, and eliminated 
> obvious differences against t8u that we accrued over the years.
> 
> Here:
>   https://cr.openjdk.java.net/~shade/shenandoah/8u-post-aarch64-cleanup-1/webrev.01/
> 
> Testing: Linux x86_64 hotspot_gc_shenandoah; Linux aarch64 build
>