[jdk25u] RFR: 8333783: java/nio/channels/FileChannel/directio/DirectIOTest.java is unstable with AV software

[Aleksey Shipilev]

Stabilizes the test.

Additional testing:
 - [ ] Linux x86_64 server fastdebug, affected test, 100x repetitions

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Commit messages:
 - Backport 8c6d12250b524c0f4ee25dbbc6fe959581b7617b

Changes: https://git.openjdk.org/jdk25u/pull/246/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=246&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333783
  Stats: 107 lines in 2 files changed: 67 ins; 23 del; 17 mod
  Patch: https://git.openjdk.org/jdk25u/pull/246.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/246/head:pull/246

PR: https://git.openjdk.org/jdk25u/pull/246