[foreign-memaccess] [Rev 05] RFR: JDK-8243073: Add support for serial confinement

[Maurizio Cimadamore]

> This patch adds support for serial confinement - e.g. a handoff operation to transfer ownership from thread A to thread
> B.
> The implementation is based on some iterations we have done in the past. I've added a test, and I've also rewritten
> some of the existing tests not to rely on waits, but to use latches instead, as observed by Paul.

Maurizio Cimadamore has updated the pull request with a new target base due to a merge or a rebase. The pull request
now contains five commits:

 - Fix wrong character in javadoc
 - Add hyperlink to "happens before" definition.
 - Clarify javadoc after discussions with Doug and Paul
 - Added more documentation about safety guarantees of the new handoff operation
   Moved full fence after instance creation
 - * Add support for withOwnerThread operation
   * added test
   * rewritten negative shared tests with pending acquired views to use latches instead of waits

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Changes: https://git.openjdk.java.net/panama-foreign/pull/117/files
 Webrev: https://webrevs.openjdk.java.net/panama-foreign/117/webrev.05
  Stats: 152 lines in 5 files changed: 126 ins; 4 del; 22 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/117.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/117/head:pull/117

PR: https://git.openjdk.java.net/panama-foreign/pull/117