[jdk21u-dev] RFR: 8317264: Pattern.Bound has `static` fields that should be `static final`.

[Francesco Andreuzzi]

Clean backport of JDK-8317264. The fields are never assigned after initialization. final leads to shorter bytecode. It's a minor performance optimization in Regex.

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Commit messages:
 - Backport ecb5e8a03f67c92d7956201de1fa7d07cc6af9cb

Changes: https://git.openjdk.org/jdk21u-dev/pull/1622/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1622&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/jdk21u-dev/pull/1622.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1622/head:pull/1622

PR: https://git.openjdk.org/jdk21u-dev/pull/1622