[8u] 2020-07-24, Bulk backports to sh/jdk8

[Roman Kennke]

Yup, looks good! Thanks you!

Roman

On Fri, 2020-07-24 at 09:03 +0200, Aleksey Shipilev wrote:
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> https://cr.openjdk.java.net/~shade/shenandoah/backports/jdk8u-20200724/webrev.01/
> 
> This backports a bunch of improvements to sh/jdk8:
>  [backport] 8249953: Shenandoah: gc/shenandoah/mxbeans tests should
> account for corner cases
>  [backport] 8248652: Shenandoah: SATB buffer handling may assume no
> forwarded objects
>  [backport] 8247367: Shenandoah: pacer should wait on lock instead of
> exponential backoff
>  [backport] 8247593: Shenandoah: should not block pacing reporters
>  [backport] 8249649: Shenandoah: provide per-cycle pacing stats
> 
> Testing: hotspot_gc_shenandoah {fastdebug,release}
>