RFR: 8257234 : Add gz option to SA jmap to write a gzipped heap dump [v13]

[Lin Zang]

On Thu, 28 Jan 2021 22:33:53 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

>> Lin Zang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fix the logic of using gz= as file name
>
> You added clhsdb testing to ClhsdbDumpheap.java, but I had also suggested adding testing to BasicJMapTest.java to test pmap. Can you please add some testing there also?

Hi @plummercj, 
> I have found that there is a bug in jcmd jmap, it could accept the argument "gz=" with no value specified.
> so jmap -dump:file=a.hprof,gz= could generate dump file successfully.

After re-think of it, the jcmd jmap issue mentioned here seems not quite related with this PR, so maybe a standalone one is better?  What do you think?

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