RFR: 8357847: (ch) AsynchronousFileChannel implementations should support FFM Buffers [v5]

[Brian Burkhalter]

> Acquire the scope of a direct buffer before it is used and release it after the task has finished with it, whether the task execution is immediate or pended.

Brian Burkhalter has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:

 - 8357912: Changes pursuant to JDK-8358958
 - Merge
 - 8357912: Add reading to test of unsupported views
 - 8357912: Add similar changes to SimpleAsynchronousFileChannelImpl
 - 8357847: Use IOUtil.bufferAddress; broaden testing of Arena types
 - 8357847: WindowsAsynchronousFileChannelImpl should support FFM Buffers

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25531/files
  - new: https://git.openjdk.org/jdk/pull/25531/files/906057a3..2914bebb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25531&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25531&range=03-04

  Stats: 67139 lines in 1197 files changed: 37833 ins; 18475 del; 10831 mod
  Patch: https://git.openjdk.org/jdk/pull/25531.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25531/head:pull/25531

PR: https://git.openjdk.org/jdk/pull/25531