RFR: 8332084: Ensure JdkConsoleImpl.restoreEcho visibility in a shutdown hook [v4]

[Stuart Marks]

On Mon, 13 May 2024 21:32:18 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> Making sure `restoreEcho` correctly reflects the state in the shutdown thread, which differs from the application's thread that issues the `readPassword()` method.
>
> Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Addresses a review comment

Marked as reviewed by smarks (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/19184#pullrequestreview-2054044199