RFR: 8264735: Make dynamic dump repeatable [v2]

[Yumin Qi]

On Tue, 6 Jul 2021 16:13:29 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

>> 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).

@calvinccheung @iklam Thanks for review!

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