RFR: 8253208: Move CDS related code to a separate class [v3]

[Mandy Chung]

On Mon, 21 Sep 2020 22:24:15 GMT, Yumin Qi <minqi at openjdk.org> wrote:

>> With more CDS related code added to VM, it is time to move CDS code to a separate class. CDS is the new class which is
>> specific to CDS.
>> Tests: tier1-4
>
> Yumin Qi has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8253208: Move CDS related code to a separate class

Marked as reviewed by mchung (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/261