RFR: 8269914: Factor out heap printing for G1 young and full gc [v3]

[Thomas Schatzl]

On Thu, 8 Jul 2021 12:25:35 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   ayang review
>
> Marked as reviewed by ayang (Committer).

Thanks @albertnetymk @kimbarrett @walulyai for your reviews.

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PR: https://git.openjdk.java.net/jdk/pull/4705