RFR: 8317264: Pattern.Bound has `static` fields that should be `static final`. [v2]

[Eamonn McManus]

> It looks to have been an oversight that `final` was omitted. The fields are never assigned after initialization. `final` leads to shorter bytecode.

Eamonn McManus has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'openjdk:master' into staticfinal
 - In `Pattern.Bound`, make some constants `static final`.
   
   It looks to have been an oversight that `final` was omitted. The fields are
   never assigned after initialization. `final` leads to shorter bytecode.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/15967/files
  - new: https://git.openjdk.org/jdk/pull/15967/files/0a63d3f6..a10cf868

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15967&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15967&range=00-01

  Stats: 255 lines in 11 files changed: 209 ins; 2 del; 44 mod
  Patch: https://git.openjdk.org/jdk/pull/15967.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15967/head:pull/15967

PR: https://git.openjdk.org/jdk/pull/15967