8387800: [lworld] PPC64 field flattening bugs in JEP 401

[TheRealMDoerr]

Some small bug fixes related to UseFieldFlattening. Can also be recreated for jdk master. Just posting it here for reference.

---

• I confirm that I make this contribution in accordance with the OpenJDK Interim AI Policy.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed (1 review required, with at least 1 Committer)

Issue

• JDK-8387800: [lworld] PPC64 field flattening bugs in JEP 401 (Bug - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/valhalla.git pull/2630/head:pull/2630
$ git checkout pull/2630

Update a local copy of the PR:
$ git checkout pull/2630
$ git pull https://git.openjdk.org/valhalla.git pull/2630/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2630

View PR using the GUI difftool:
$ git pr show -t 2630

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/valhalla/pull/2630.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back mdoerr! 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.

[mlbridge]

Webrevs

• 00: Full (29b74f93)