[foreign-preview] RFR: Merge foreign-memaccess+abi

[Jorn Vernee]

Manual merge of foreign-memaccess+abi into foreign-preview

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

Commit messages:
 - 8277845: Clean up use if ProgrammableInvoker/UpcallHandler.USE_INTRINSICS in tests.
 - Automatic merge of master into foreign-memaccess+abi
 - Merge master
 - Automatic merge of master into foreign-memaccess+abi
 - Automatic merge of master into foreign-memaccess+abi
 - Automatic merge of master into foreign-memaccess+abi
 - 8278151: Heap segments should handle alignment constraints in a deterministic fashion
 - Merge master
 - Merge master
 - 8277945: Use snippets in jdk.incubator.foreign API documentation
 - ... and 641 more: https://git.openjdk.java.net/panama-foreign/compare/b4951efe...1e1574c9

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.java.net/panama-foreign/pull/631/files
  Stats: 30344 lines in 126 files changed: 26914 ins; 2659 del; 771 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/631.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/631/head:pull/631

PR: https://git.openjdk.java.net/panama-foreign/pull/631