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

[Yasumasa Suenaga]

On Wed, 10 Feb 2021 04:04:56 GMT, Lin Zang <lzang at openjdk.org> wrote:

>> 8257234 : Add gz option to SA jmap to write a gzipped heap dump
>
> 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).

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