RFR: JDK-8306304: Fix xlc17 clang warnings in ppc and aix code [v2]

[Kim Barrett]

On Mon, 15 May 2023 09:52:59 GMT, JoKern65 <duke at openjdk.org> wrote:

>> Such a fix of adlc is probably out of scope for this change though.  We should probably have a separate bug for that.
>
> And what should I use as a workaround meanwhile to get our new compiler through?

Now that I understand what the proposed change (adding an extra level of parens) is for, I'm okay with that
for this PR.  But there should be some followup to look at the code generated by adlc in this area.  There could
be other places where the wrong thing is being done but not generating a warning.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13953#discussion_r1196243839