RFR: 8264735: Make dynamic dump repeatable [v2]

[Calvin Cheung]

On Fri, 2 Jul 2021 20:12:23 GMT, Yumin Qi <minqi at openjdk.org> wrote:

>> Hi, Please review
>> 
>>   Currently after dynamic dump, dump time tables (`_dumptime_talbles, _dumptime_lambda_proxy_class_dictionary and _saved_shared_path_table`) are corrupted and could not be used for next dump. The patch clones the three tables, and after dump restore them so the next dump is possible. With the fix, jcmd VM.cds dynamic_dump can do multiple dump to the same live process.
>> 
>>   Tests: tier1,tier2,tier3,tier4
>>   
>>   Thanks
>>   Yumin
>
> Yumin Qi has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix comments, added check holding for DumpTimeTable_lock

Marked as reviewed by ccheung (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/4646