[8] RFC: Pick up 8u252-ga from upstream

[Zhengyu Gu]

Okay.

-Zhengyu

On 4/15/20 5:20 AM, Aleksey Shipilev wrote:
> Upstream aarch64-port/jdk8u-shenandoah had posted 8u252-ga tag. Let's pick it up to sh/jdk8.
> 
> Merge is trivial/simple. Changesets are big and not useful for review.
> 
> Testing: hotspot_gc_shenandoah {fastdebug,release}
>