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

[Vishal Chand]

On Tue, 30 Nov 2021 16:12:57 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Vishal Chand has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Rename BOTConstants
>
> src/hotspot/share/gc/parallel/objectStartArray.hpp line 52:
> 
>> 50:   static uint _block_size;
>> 51:   static uint _block_size_in_words;
>> 52: 
> 
> Almost the same naming issue as in the `BlockOffsetTable/SharedArray`; I would prefer if these members (and getters) here were named similarly to the ones there.
> It is true that `ObjectStartArray` and `BlockOffsetTable` are basically the same thing, but any eventual merge is another issue.

Shall these be renamed to osa_card_shift? Something like this?

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