Strict final fields

[matias9927]

---

Progress

• Change must not contain extraneous whitespace

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/valhalla.git pull/1343/head:pull/1343
$ git checkout pull/1343

Update a local copy of the PR:
$ git checkout pull/1343
$ git pull https://git.openjdk.org/valhalla.git pull/1343/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 1343

View PR using the GUI difftool:
$ git pr show -t 1343

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/valhalla/pull/1343.diff

[bridgekeeper]

👋 Welcome back matsaave! A progress list of the required criteria for merging this PR into lworld will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

⚠️ @matias9927 This pull request contains merges that bring in commits not present in the target repository. Since this is not a "merge style" pull request, these changes will be squashed when this pull request in integrated. If this is your intention, then please ignore this message. If you want to preserve the commit structure, you must change the title of this pull request to Merge <project>:<branch> where <project> is the name of another project in the OpenJDK organization (for example Merge jdk:master).

[liach]

Does this depend on #1333?