RFR: 8253600: G1: Fully support pinned regions for full gc [v3]

[Thomas Schatzl]

On Mon, 2 Nov 2020 14:04:37 GMT, Stefan Johansson <sjohanss at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains five commits:
>> 
>>  - Merge branch 'master' into 8253600-full-gc-pinned-region-support
>>  - Merge branch 'master' into 8253600-full-gc-pinned-region-support
>>  - sjohanss review
>>    
>>    Also remove _archive_allocator_map et al as the new attribute table
>>    implements the same functionality also suggested by sjohanss in
>>    private.
>>  - Initial import
>>  - Initial import
>
> Thanks Thomas for addressing my concerns around the archive-map and the new region-attr overlap. I think this looks much better. 
> 
> Just a few additional comments.

- I'll file a CR for that investigation. In my recent measurements of a different full-iterate-all-regions closure we are talking about something < 0.0x ms.
- added an `is_in_pinned` method, and since now we've got three not-completely-trivial methods added a `.inline.hpp` file. I did not see need for moving the completely trivial getters returning just a member variable there, but tell me if I should move them too.
- moved "implementation" of `CollectedHeap::is_archived_object` to .cpp file

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PR: https://git.openjdk.java.net/jdk/pull/824