RFR: 8285081: Improve XPath operators count accuracy [v3]

[Joe Wang]

> Adjust how XPath operators are counted to improve accuracy. This change does not affect how XPath works. 
> 
> Test:  
>      Tier2 passed;
>      JCK XML tests passed.

Joe Wang has updated the pull request incrementally with one additional commit since the last revision:

  remove unused parameter

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/9022/files
  - new: https://git.openjdk.java.net/jdk/pull/9022/files/e1e3deb2..6dc1cc2c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=9022&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=9022&range=01-02

  Stats: 9 lines in 1 file changed: 0 ins; 0 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk/pull/9022.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/9022/head:pull/9022

PR: https://git.openjdk.java.net/jdk/pull/9022