[foreign-jextract] RFR: 8265072: Use MemoryAddress instead of MemorySegment in CLinker::upcallStub

[Maurizio Cimadamore]

Fix jextract downstream issues caused by changes in signature of `CLinker::upcallStub`.

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

Commit messages:
 - Initial push

Changes: https://git.openjdk.java.net/panama-foreign/pull/499/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=499&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8265072
  Stats: 43 lines in 7 files changed: 0 ins; 2 del; 41 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/499.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/499/head:pull/499

PR: https://git.openjdk.java.net/panama-foreign/pull/499