RFR: 8259070: Add jcmd option to dump CDS [v3]

[Ioi Lam]

On Wed, 10 Mar 2021 04:22:07 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> Yumin Qi has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix white space in CDS.java
>
> src/java.base/share/classes/jdk/internal/misc/CDS.java line 278:
> 
>> 276:             dumpDynamicArchive(archiveFile);
>> 277:         }
>> 278:     }
> 
> I think we should have some error checks and clean up:
> 
> - Remove the classlist file
> - Check if if the process exit status is 0
> - Remove the JSA file first, then try to dump it, and check if the file exists afterwards. If not, report the error. (For both dynamic and static dumps)

The classlist file is not deleted after the dump has finished.

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