RFR: JDK-8317636: Improve heap walking API tests to verify correctness of field indexes

[Alex Menkov]

The fix adds new test for FollowReferences JVMTI function to verify correctness of reported field indexes.

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Commit messages:
 - jcheck
 - new test

Changes: https://git.openjdk.org/jdk/pull/17580/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17580&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317636
  Stats: 645 lines in 2 files changed: 645 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/17580.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17580/head:pull/17580

PR: https://git.openjdk.org/jdk/pull/17580