RFR: 8306749: Make CardTable::invalidate non-virtual

[Albert Mingkun Yang]

On Mon, 24 Apr 2023 13:08:10 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial removing unused `virtual` specifier.

Thanks for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/13617#issuecomment-1523222703