[foreign-memaccess] [Rev 01] RFR: Alternative scalable MemoryScope

[Peter Levart]

> This is an alternative MemoryScope which is more scalable when used in a scenario where child scope is frequently
> acquired and closed concurrently from multiple threads (for example in parallel Stream.findAny())

Peter Levart has updated the pull request incrementally with one additional commit since the last revision:

  Don't re-use acquires/releases LongAdder(s) fot duped scope

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Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/142/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/142/files/95ee7671..04cb4f8c

Webrevs:
 - full: https://webrevs.openjdk.java.net/panama-foreign/142/webrev.01
 - incr: https://webrevs.openjdk.java.net/panama-foreign/142/webrev.00-01

  Stats: 17 lines in 1 file changed: 0 ins; 10 del; 7 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/142.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/142/head:pull/142

PR: https://git.openjdk.java.net/panama-foreign/pull/142