RFR: 8287809: Revisit implementation of memory session [v3]

[Maurizio Cimadamore]

> This is a JDK 19 clone of: https://urldefense.com/v3/__https://github.com/openjdk/jdk/pull/9017__;!!ACWV5N9M2RV99hQ!Iad5ZYIBKo6G8OmmBEpmRZekLOyVUfHNgi9JARpVmrUedI3fLRC3VvMwy4h-WDdnsbZ71KGxv99JP5gzdsD4RP7upCEDuQ$ 

Maurizio Cimadamore has updated the pull request incrementally with one additional commit since the last revision:

  Unify heap vs. implicit scopes

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Changes:
  - all: https://git.openjdk.org/jdk19/pull/22/files
  - new: https://git.openjdk.org/jdk19/pull/22/files/be81918f..b605aeab

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk19&pr=22&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk19&pr=22&range=01-02

  Stats: 12 lines in 3 files changed: 3 ins; 4 del; 5 mod
  Patch: https://git.openjdk.org/jdk19/pull/22.diff
  Fetch: git fetch https://git.openjdk.org/jdk19 pull/22/head:pull/22

PR: https://git.openjdk.org/jdk19/pull/22