[jdk15u-dev] Integrated: 8265231: (fc) ReadDirect and WriteDirect tests fail after fix for JDK-8264821

[Sergey Nazarkin]

This follow up for JDK-8264821. Applies clean. All tests at java/nio/channels/FileChannel/ are green now.

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Commit messages:
 - Backport d1b28e7ad07bda33cd4e35b58b7f6dccfac3435c

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/86/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=86&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8265231
  Stats: 26 lines in 5 files changed: 0 ins; 17 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/86.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/86/head:pull/86

PR: https://git.openjdk.java.net/jdk15u-dev/pull/86