[foreign-jextract] RFR: 8237585: Dismantle ForeignUnsafe (foreign-jextract part)

[Jorn Vernee]

Hi,

These are the foreign-jextract changes that are needed after https://github.com/openjdk/panama-foreign/pull/56.

Jorn

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Commit messages:
 - Jextract changes after dismantling ForeignUnsafe

Changes: https://git.openjdk.java.net/panama-foreign/pull/57/files
 Webrev: https://webrevs.openjdk.java.net/panama-foreign/57/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8237585
  Stats: 31 lines in 18 files changed: 10 ins; 2 del; 19 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/57.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/57/head:pull/57

PR: https://git.openjdk.java.net/panama-foreign/pull/57