RFR: 8333774: Avoid eagerly loading various EmptySpliterator classes [v3]

[Claes Redestad]

> Trivially move a few private static finals to their respective source type to avoid eagerly loading a few small classes.

Claes Redestad has updated the pull request incrementally with one additional commit since the last revision:

  Update src/java.base/share/classes/java/util/Spliterators.java
  
  Co-authored-by: Chen Liang <liangchenblue at gmail.com>

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Changes:
  - all: https://git.openjdk.org/jdk/pull/19591/files
  - new: https://git.openjdk.org/jdk/pull/19591/files/9d19bbe1..10611afd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19591&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19591&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/19591.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19591/head:pull/19591

PR: https://git.openjdk.org/jdk/pull/19591