pkg:compiler - enable and fix `prefer_final_fields` lint

Change-Id: I042f6047c2c10490121398027489217c6291425d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/211622
Auto-Submit: Kevin Moore <kevmoo@google.com>
Commit-Queue: Kevin Moore <kevmoo@google.com>
Reviewed-by: Stephen Adams <sra@google.com>

https://dart.googlesource.com/sdk/+/70533ae7fa89c28dffe6ae1e693c124278ff6a34
1 file changed
tree: ac8dd1db98ed898878b3713707c837d9c023d47a
  1. commits.json