RFR: 8357847: (ch) WindowsAsynchronousFileChannelImpl should support FFM Buffers [v3]

[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:

  8357912: Add similar changes to SimpleAsynchronousFileChannelImpl

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25531/files
  - new: https://git.openjdk.org/jdk/pull/25531/files/82fb9e0b..9d8ed193

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25531&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25531&range=01-02

  Stats: 15 lines in 1 file changed: 14 ins; 0 del; 1 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