RFR: 8267281: Call prepare_for_dynamic_dumping for jcmd dynamic_dump [v2]

[Yumin Qi]

On Mon, 12 Jul 2021 17:54:41 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> Yumin Qi has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Modified log message and test case for checking this message
>
> LGTM, but I think the issue title should be changed to something like "call prepare_for_dynamic_dumping for jcmd dynamic_dump".

@iklam @calvinccheung Thanks for review!

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PR: https://git.openjdk.java.net/jdk/pull/4736