[foreign-memaccess] RFR: Investigate ways to make handoff-like operation more explicit (foreign-memacess edition) [v2]

[Maurizio Cimadamore]

> This is a subset of the patch proposed here:
> https://git.openjdk.java.net/panama-foreign/pull/361
> 
> I'd like to integrate the memory access bits first and then merge the changes into PR 361.

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

  Address review comments

-------------

Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/363/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/363/files/f4b79c97..dd547638

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=363&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=363&range=00-01

  Stats: 9 lines in 2 files changed: 8 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/363.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/363/head:pull/363

PR: https://git.openjdk.java.net/panama-foreign/pull/363