Re-work of arrays meta-data

[fparain]

First step: creation of refArrayKlass to describe references arrays, keeping Java type related code in objArrayKlass.
When run with -XX:+UseNewCode2 -Xshare:off, the VM uses refArrayKlass instances as meta-data for refefences arrays and objArrayKlass should not be instantiated directly anymore.

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Progress

• Change must not contain extraneous whitespace

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/valhalla.git pull/1452/head:pull/1452
$ git checkout pull/1452

Update a local copy of the PR:
$ git checkout pull/1452
$ git pull https://git.openjdk.org/valhalla.git pull/1452/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 1452

View PR using the GUI difftool:
$ git pr show -t 1452

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/valhalla/pull/1452.diff

[bridgekeeper]

👋 Welcome back fparain! 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.

[coleenp]

Makes sense - found a typo. Are you going to check this in with UseNewCode2 or you could add a global flag for this because I think you're going to need a new one?

[coleenp]

you have an extra j in this.

[coleenp]

The stars go with the types, ie ClassLoaderData* loader_data.

[openjdk]

@fparain this pull request can not be integrated into lworld due to one or more merge conflicts. To resolve these merge conflicts and update this pull request you can run the following commands in the local repository for your personal fork:

git checkout array_klasses
git fetch https://git.openjdk.org/valhalla.git lworld
git merge FETCH_HEAD
# resolve conflicts and follow the instructions given by git merge
git commit -m "Merge lworld"
git push