RFR: 8334769: Shenandoah: Move CodeCache_lock close to its use in ShenandoahConcurrentNMethodIterator

[Kelvin Nilsen]

On Mon, 24 Jun 2024 13:46:23 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> ShenandoahConcurrentNMethodIterator requires CodeCache_lock at begin and end of iteration.
> 
> Currently, the CodeCache_lock is acquired by their callers, which is not very obvious and readable. Let's move the lock inside the methods.

Thanks.

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Marked as reviewed by kdnilsen (Author).

PR Review: https://git.openjdk.org/jdk/pull/19859#pullrequestreview-2142481062