git: openjdk/jdk: 8307563: make most fields final in `JavacTrees`

[Jonathan Gibbons]

Changeset: 958d4a75
Author:    Jonathan Gibbons <jjg at openjdk.org>
Date:      2023-05-10 22:23:04 +0000
URL:       https://git.openjdk.org/jdk/commit/958d4a750537320bf4e4f5cedd2e1a9a2e52ae33

8307563: make most fields final in `JavacTrees`

Reviewed-by: vromero

! src/jdk.compiler/share/classes/com/sun/tools/javac/api/JavacTrees.java