RFR: 8289739: Add G1 specific GC breakpoints for testing

[Thomas Schatzl]

On Wed, 6 Jul 2022 08:37:53 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

>> Hi all,
>> 
>>   can I have reviews for this change that adds a few G1 specific GC breakpoints for future testing [JDK-8289740](https://bugs.openjdk.org/browse/JDK-8289740).
>> 
>> Testing: gha, local testing
>> 
>> Thanks,
>>   Thomas
>
> Marked as reviewed by iwalulya (Reviewer).

Thanks @walulyai @kimbarrett for your reviews

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PR: https://git.openjdk.org/jdk/pull/9376