RFR: 8261905: Move implementation of OopStorage num_dead related functions [v2]

[Kim Barrett]

On Wed, 17 Feb 2021 15:39:02 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Kim Barrett has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:
>> 
>>  - Merge branch 'master' into move_num_dead
>>  - move num_dead functions
>
> Marked as reviewed by ayang (Author).

Thanks @albertnetymk and @tschatzl for reviews.

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PR: https://git.openjdk.java.net/jdk/pull/2608