RFR: 8257234 : Add gz option to SA jmap to write a gzipped heap dump [v7]

[Lin Zang]

On Tue, 19 Jan 2021 21:59:16 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 issue of setting gz option with no value
>
> I think you need to add some additional testing. You can use ClhsdbDumpheap.java and also BasicJMapTest.java. Besides testing with a compressed hprof file, also add a test for "gz=" with no compression value and with invalid compression value.

Hi @plummercj, 
I have done some fixes related to gziped heap dump and add several subtests. May I ask your help to review again?
Thanks!
Lin

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