[foreign-memaccess+abi] RFR: 8293367: Enable native access for modules not in the boot layer [v2]

[Athijegannathan Sundararajan]

> Adding a new API ModuleLayer.Controller.enableNativeAccess(Module).
> Reworked thread safety of enable native access flag reading and setting.

Athijegannathan Sundararajan has updated the pull request incrementally with one additional commit since the last revision:

  review comments.

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Changes:
  - all: https://git.openjdk.org/panama-foreign/pull/729/files
  - new: https://git.openjdk.org/panama-foreign/pull/729/files/e9de8914..4f1cf4d1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=panama-foreign&pr=729&range=01
 - incr: https://webrevs.openjdk.org/?repo=panama-foreign&pr=729&range=00-01

  Stats: 10 lines in 3 files changed: 4 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/panama-foreign/pull/729.diff
  Fetch: git fetch https://git.openjdk.org/panama-foreign pull/729/head:pull/729

PR: https://git.openjdk.org/panama-foreign/pull/729