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

[Naoto Sato]

Making sure `restoreEcho` correctly reflects the state in the shutdown thread, which differs from the application's thread that issues the `readPassword()` method.

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Commit messages:
 - initial commit

Changes: https://git.openjdk.org/jdk/pull/19184/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19184&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332084
  Stats: 7 lines in 1 file changed: 2 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/19184.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19184/head:pull/19184

PR: https://git.openjdk.org/jdk/pull/19184