[foreign-jextract] RFR: 8249879: Split MemorySegment and MemoryAddress (jextract edition) [v2]

[Maurizio Cimadamore]

> This patch fixes uses of memory segments and address following the big refactoring introduced by
> https://git.openjdk.java.net/panama-foreign/pull/260 from sources and tests.

Maurizio Cimadamore has updated the pull request incrementally with two additional commits since the last revision:

 - Remove AllocationScope and replace its uses with NativeAllocationScope
 - * re-enable cursor upcall optimization
   * drop Utils class and replace its usages with MemoryAccess

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

Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/267/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/267/files/4162852c..b34b3e36

Webrevs:
 - full: https://webrevs.openjdk.java.net/panama-foreign/267/webrev.01
 - incr: https://webrevs.openjdk.java.net/panama-foreign/267/webrev.00-01

  Stats: 190 lines in 10 files changed: 24 ins; 142 del; 24 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/267.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/267/head:pull/267

PR: https://git.openjdk.java.net/panama-foreign/pull/267