RFR: 8378880: GenShen: Fix typo in recent conversion to atomic field

[Xiaolong Peng]

On Fri, 27 Feb 2026 23:21:01 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Fix typo

I think I introduced it, sorry for the stupid typo, I had to read it multiple times to realize the typo!

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Marked as reviewed by xpeng (Committer).

PR Review: https://git.openjdk.org/jdk/pull/29972#pullrequestreview-3869591006