[foreign-abi] RFR: Merge openjdk/panama-foreign:foreign-memaccess

[Maurizio Cimadamore]

Merge with foreign-memaccess

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Commit messages:
 - Merge foreign-memaccess
 - 8240874: Add finer-grained access control for memory segments

Changes: https://git.openjdk.java.net/panama-foreign/pull/47/files
 Webrev: https://webrevs.openjdk.java.net/panama-foreign/47/webrev.00
  Stats: 279 lines in 7 files changed: 201 ins; 34 del; 44 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/47.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/47/head:pull/47

PR: https://git.openjdk.java.net/panama-foreign/pull/47