[jdk21u-dev] RFR: 8317635: Improve GetClassFields test to verify correctness of field order

[Andrew Lu]

I backport this for parity with 21.0.5-oracle.

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Commit messages:
 - Backport 599560a832386d9c61aca24450d6efa65156f663

Changes: https://git.openjdk.org/jdk21u-dev/pull/721/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=721&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317635
  Stats: 176 lines in 3 files changed: 62 ins; 52 del; 62 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/721.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/721/head:pull/721

PR: https://git.openjdk.org/jdk21u-dev/pull/721