[foreign-memaccess] RFR: 8249790: Add Addressable abstraction (followup)

[Maurizio Cimadamore]

Some renaming was missed in this iteration, in comments and in one test.

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Commit messages:
 - Fix missing renames

Changes: https://git.openjdk.java.net/panama-foreign/pull/255/files
 Webrev: https://webrevs.openjdk.java.net/panama-foreign/255/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8249790
  Stats: 13 lines in 4 files changed: 0 ins; 0 del; 13 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/255.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/255/head:pull/255

PR: https://git.openjdk.java.net/panama-foreign/pull/255