RFR: Use CardTable::card_size_in_words rather than hard coded constant [v3]

[Y. Srinivas Ramakrishna]

On Mon, 19 Dec 2022 18:54:12 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> Calculation assumed 64 words per card, which does not hold on 32 bit word platforms
>
> William Kemper has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:
> 
>   Do not assume cards will have 64 words

Marked as reviewed by ysr (Author).

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PR: https://git.openjdk.org/shenandoah/pull/186