RFR: 8285081: Improve XPath operators count accuracy [v2]

[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:

  review update

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/9022/files
  - new: https://git.openjdk.java.net/jdk/pull/9022/files/f840e840..e1e3deb2

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=9022&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=9022&range=00-01

  Stats: 13 lines in 2 files changed: 4 ins; 7 del; 2 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