[jdk22u] RFR: 8325179: Race in BasicDirectoryModel.validateFileCache

[Alexey Ivanov]

Backporting [JDK-8325179](https://bugs.openjdk.org/browse/JDK-8325179): _Race in BasicDirectoryModel.validateFileCache_.

The patch applies cleanly. (After applying [JDK-8327137](https://bugs.openjdk.org/browse/JDK-8327137).)

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Commit messages:
 - Backport e66788c16563d343f6cccd2807a251ccc6f9b64a

Changes: https://git.openjdk.org/jdk22u/pull/164/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk22u&pr=164&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8325179
  Stats: 69 lines in 1 file changed: 17 ins; 21 del; 31 mod
  Patch: https://git.openjdk.org/jdk22u/pull/164.diff
  Fetch: git fetch https://git.openjdk.org/jdk22u.git pull/164/head:pull/164

PR: https://git.openjdk.org/jdk22u/pull/164