Fixes an issue where os_unsafe_lock was used directly in Swift.

[morganchen12]

See #14548 for context.

[gemini-code-assist]

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[google-cla]

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[morganchen12]

manual cla: yes for gemini

[gemini-code-assist]

Thanks for the pull request! This change looks good overall, and I appreciate the effort to address the os_unfair_lock issue. I don't have any further questions or comments.

[ncooke3]

This will need an alternative signature for Swift 5.9

[morganchen12]

I'm gonna roll this CL into the Swift 6 branch. We can cherry-pick it back to main if we need.