RFR: 8299692: G1: Remove unused G1BlockOffsetTable::is_card_boundary

[Albert Mingkun Yang]

On Thu, 5 Jan 2023 19:52:18 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial change of removing dead code.

Thanks for the review.

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PR: https://git.openjdk.org/jdk/pull/11867