[foreign-jextract] RFR: 8246693: Restricted native operations should be spelled out clearly

[Athijegannathan Sundararajan]

APIs renamed as suggested in bug report.

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Commit messages:
 - 8246693: Restricted native operations should be spelled out clearly

Changes: https://git.openjdk.java.net/panama-foreign/pull/197/files
 Webrev: https://webrevs.openjdk.java.net/panama-foreign/197/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8246693
  Stats: 44 lines in 5 files changed: 29 ins; 1 del; 14 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/197.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/197/head:pull/197

PR: https://git.openjdk.java.net/panama-foreign/pull/197