RFR: 8279500: Remove FileMapHeader::_heap_obj_roots [v2]

[Ioi Lam]

On Fri, 7 Jan 2022 06:13:41 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

>> Ioi Lam 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' of https://github.com/openjdk/jdk into 8279500-remove-filemapheader-heap_obj_roots
>>  - 8279500: Remove FileMapHeader::_heap_obj_roots
>
> LGTM.

Thanks @calvinccheung and @yminqi for the review. Passed Mach5 tiers 1-4.

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PR: https://git.openjdk.java.net/jdk/pull/6973