RFR: JDK-8317636: Improve heap walking API tests to verify correctness of field indexes [v3]

[Alex Menkov]

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

Alex Menkov has updated the pull request incrementally with one additional commit since the last revision:

  indent

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17580/files
  - new: https://git.openjdk.org/jdk/pull/17580/files/c5e7b787..a0fffef3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17580&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17580&range=01-02

  Stats: 391 lines in 1 file changed: 56 ins; 56 del; 279 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