[foreign-memaccess+abi] RFR: Improve NIO channel support for buffer views over segments [v5]

[Chris Hegarty]

> Initial prototype changes to use resource scope handles when performing I/O operations with synchronous and asynchronous channels.
> 
> Further details can be found at: https://inside.java/2021/01/25/memory-access-pulling-all-the-threads/

Chris Hegarty has updated the pull request incrementally with one additional commit since the last revision:

  Additional test fix for Windows

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Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/512/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/512/files/297b6531..3c08280d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=512&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=512&range=03-04

  Stats: 11 lines in 1 file changed: 10 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/512.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/512/head:pull/512

PR: https://git.openjdk.java.net/panama-foreign/pull/512