RFR: 8259070: Add jcmd option to dump CDS [v4]

[Yumin Qi]

On Fri, 19 Mar 2021 05:39:25 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> Yumin Qi has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:
>> 
>>  - Fix filter more flags to exclude in static dump, add more test cases
>>  - Merge branch 'master' into jdk-8259070
>>  - Fix white space in CDS.java
>>  - Add function CDS.dumpSharedArchive in java to dump shared archive
>>  - 8259070: Add jcmd option to dump CDS
>
> Changes requested by iklam (Reviewer).

@iklam Thanks. Yes, the comment out for the deletion is unintentional for test only and forgot to revert. I will revert it. Also I will merge with upstream. Since this repo has no merge from upstream for long time, it may cause conflicts. If too many conflicts to  resolve I would like to withdraw this one and resubmit as a new PR. Thanks.

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PR: https://git.openjdk.java.net/jdk/pull/2737