RFR: 8250961: Move Universe::update_heap_info_at_gc to CollectedHeap [v2]

[Kim Barrett]

On Tue, 8 Sep 2020 23:55:53 GMT, Aditya Mandaleeka <adityam at openjdk.org> wrote:

>> This is a small refactoring that moves `update_heap_info_at_gc()` and related members to `CollectedHeap`. There should
>> be no behavioral change.
>> jdk/hotspot tier1 passed
>> 
>> JBS: https://bugs.openjdk.java.net/browse/JDK-8250961
>
> Aditya Mandaleeka has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Rename and rearrange things a bit per feedback.

I'm assuming the small changes to free/used_at_last_gc will be made.

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Marked as reviewed by kbarrett (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/27