RFR: 8302127: Remove unused arg in write_ref_field_post

[Kim Barrett]

On Thu, 9 Feb 2023 10:56:10 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial removing dead code.

Looks good.

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Marked as reviewed by kbarrett (Reviewer).

PR: https://git.openjdk.org/jdk/pull/12489