RFR: 8296932: G1: Remove unused G1RootClosures::weak_oops

[Albert Mingkun Yang]

On Mon, 14 Nov 2022 11:28:43 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple change of removing dead code.

Thanks for the review.

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PR: https://git.openjdk.org/jdk/pull/11134