[jdk11u-dev] RFR: 8285081: Improve XPath operators count accuracy

[Goetz Lindenmaier]

I backport this for parity with 11.0.17-oracle.

-------------

Commit messages:
 - Backport 8e0783917975075aae5d586f0076d5093afb0b62

Changes: https://git.openjdk.org/jdk11u-dev/pull/1232/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1232&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/jdk11u-dev/pull/1232.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1232/head:pull/1232

PR: https://git.openjdk.org/jdk11u-dev/pull/1232