RFR: 8277372: Add getters for BOT and card table members [v4]

[Stefan Johansson]

On Tue, 30 Nov 2021 13:39:41 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 incrementally with one additional commit since the last revision:
> 
>   Rename BOTConstants

Nice to see this unified. Some comments below.

src/hotspot/share/gc/shared/blockOffsetTable.hpp line 55:

> 53:   static uint _log_bot_card_size_words;
> 54:   static uint _bot_card_size_bytes;
> 55:   static uint _bot_card_size_words;

Maybe change `words` to `in_words` to better match other places where we have sizes in words. And as Thomas suggested above, maybe also drop the `bot` in/pre-fix. 

And also change the getters below.

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Changes requested by sjohanss (Reviewer).

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