[jdk17u-dev] RFR: 8289949: Improve test coverage for XPath: operators

[Goetz Lindenmaier]

I backport this for parity with 17.0.8-oracle.

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Commit messages:
 - Backport f6b636015573f9b88133efba2f87bed80f463a96

Changes: https://git.openjdk.org/jdk17u-dev/pull/1280/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1280&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289949
  Stats: 141 lines in 1 file changed: 141 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1280.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1280/head:pull/1280

PR: https://git.openjdk.org/jdk17u-dev/pull/1280