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

[Kim Barrett]

On Mon, 22 May 2023 07:09:30 GMT, JoKern65 <duke at openjdk.org> wrote:

>> The final suggested change (to direct-value-initialize the object) seems to have *not* been made.
>> 
>> However, I think it doesn't matter.  The mentioned restriction against being non-empty until C23 is not relevant.
>> This is C++, not C.  Empty initializers are, and have always been, permitted by C++.
>
> Strange the last resulting change I see is
> `struct shmid_ds shm_buf{};`

That's not what I see in this PR, and not what I see in the repository after the integration.  Where are you seeing
that?  (If in your local repository, maybe you forgot a push to the PR?)

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PR Review Comment: https://git.openjdk.org/jdk/pull/13953#discussion_r1203353066