[jdk17u-dev] RFR: 8285081: Improve XPath operators count accuracy

[Goetz Lindenmaier]

I backport this for parity with 17.0.5-oracle.

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Commit messages:
 - Backport 8e0783917975075aae5d586f0076d5093afb0b62

Changes: https://git.openjdk.org/jdk17u-dev/pull/478/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=478&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8285081
  Stats: 63 lines in 3 files changed: 40 ins; 3 del; 20 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/478.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/478/head:pull/478

PR: https://git.openjdk.org/jdk17u-dev/pull/478