RFR: 8290223: Initialize G1CardClosure in card scanning once

[Thomas Schatzl]

On Wed, 13 Jul 2022 09:16:29 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   please review this minor change to avoid repeatedly initializing `G1CardClosure` in card scanning.
> 
> Testing: gha, local compilation
> 
> Thanks,
>   Thomas

Closing after re-measuring.

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PR: https://git.openjdk.org/jdk/pull/9478