RFR: 8277372: Add getters for BOT and card table members [v6]

[Albert Mingkun Yang]

On Fri, 3 Dec 2021 12:03:45 GMT, Vishal Chand <duke at openjdk.java.net> wrote:

>> Changed the visibility, added getters and refactored the following:
>> 
>> 1. Card Table Members
>> 2. BOT members
>> 3. ObjectStartArray block members
>
> Vishal Chand has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains six commits:
> 
>  - Merge branch 'master' into JDK-8277372-refactor
>  - Rename BOTConstants and ObjectStartArray members to _card_*
>  - Rename BOTConstants
>  - Merge branch 'master' into JDK-8277372-refactor
>  - Refactoring in hotspot/cpu dir
>  - Initial patch

Just a very minor comment.

src/hotspot/share/gc/parallel/objectStartArray.cpp line 47:

> 45:   // We're based on the assumption that we use the same
> 46:   // size blocks as the card table.
> 47:   assert((int)_card_size == (int)(CardTable::card_size()), "Sanity");

I think the `int` cast can be dropped; both sides are `uint`.

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Marked as reviewed by ayang (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/6570