RFR: 8290739: Simplify storage of dump-time class information [v3]

[Ioi Lam]

On Wed, 27 Jul 2022 17:13:52 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

>> Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fixed whitespaces
>
> Updates look good.

Thanks to @calvinccheung for the review.
Passed tiers 1-4

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PR: https://git.openjdk.org/jdk/pull/9634