RFR: 8257234 : Add gz option to SA jmap to write a gzipped heap dump [v17]

[Lin Zang]

On Mon, 8 Feb 2021 22:03:18 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

>> Lin Zang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   refine code for argument parsing
>
> Marked as reviewed by cjplummer (Reviewer).

Thanks @plummercj @sspitsyn @YaSuenag  a lot for helping review this PR again and again! 
I have marked it as ready for push.

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