RFR: 8357847: (ch) WindowsAsynchronousFileChannelImpl should support FFM Buffers [v2]

[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 incrementally with one additional commit since the last revision:

  8357847: Use IOUtil.bufferAddress; broaden testing of Arena types

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25531/files
  - new: https://git.openjdk.org/jdk/pull/25531/files/10000234..82fb9e0b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25531&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25531&range=00-01

  Stats: 48 lines in 2 files changed: 41 ins; 2 del; 5 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