RFR: 8304711: Combine G1 root region abort and wait into a single method

[Ivan Walulya]

On Wed, 22 Mar 2023 15:59:15 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   merge root region scan and abort calls into a single method as they are used together twice; this also helps with [JDK-8300770](https://bugs.openjdk.org/browse/JDK-8300770) later.
> 
> Testing: gha
> 
> Thanks,
>   Thomas

Marked as reviewed by iwalulya (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/13145#pullrequestreview-1353346517