RFR: 8257234 : Add gz option to SA jmap to write a gzipped heap dump [v20]

[Lin Zang]

On Wed, 10 Feb 2021 04:23:43 GMT, Yasumasa Suenaga <ysuenaga at openjdk.org> wrote:

>> Lin Zang has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - fix indentation isue
>>  - fix help message issue and Use ByteBuffer for integer writing
>
> Marked as reviewed by ysuenaga (Reviewer).

Dear @sspitsyn, 
    May I ask your help to approve when it is ok to you and there is no more issues? No hurry, and please surly take your time, I just want to check the status :)  
    Thanks!
Lin

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PR: https://git.openjdk.java.net/jdk/pull/1712