RFR: 8276205: Shenandoah: CodeCache_lock should always be held for initializing code cache iteration

[Aleksey Shipilev]

On Mon, 1 Nov 2021 16:48:03 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> > ShenandoahConcurrentRootScanner
> 
> Does it matter?

You tell me, I think it would be full of dangling references after we are done with scanner? The similar reason why we do `_table = NULL` in a similar method in another iterator. You don't have to change it here, but maybe a simple cleanup for later.

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PR: https://git.openjdk.java.net/jdk/pull/6192