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

[Lin Zang]

On Fri, 19 Feb 2021 20:01:08 GMT, Chris Plummer <cjplummer 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 cjplummer (Reviewer).

Mark it as ready for pushing. Thanks @plummercj @sspitsyn and @YaSuenag for help reviewing!

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