[jdk17u-dev] RFR: 8317264: Pattern.Bound has `static` fields that should be `static final`.

[Roland Mesde]

Backporting JDK-8317264: Pattern.Bound has static fields that should be static final. It was an oversight that final was omitted. The fields are never assigned after initialization. final leads to shorter bytecode.

Ran GHA Sanity Checks (passed) and related test (passed). Patch is clean.

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Commit messages:
 - Backport ecb5e8a03f67c92d7956201de1fa7d07cc6af9cb

Changes: https://git.openjdk.org/jdk17u-dev/pull/4179/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=4179&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317264
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/4179.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/4179/head:pull/4179

PR: https://git.openjdk.org/jdk17u-dev/pull/4179