RFR: JDK-8306304: Fix xlc17 clang warnings in ppc and aix code [v3]

Wed May 17 11:54:38 UTC 2023

On Wed, 17 May 2023 11:49:24 GMT, JoKern65 <duke at openjdk.org> wrote:

>> When using the new xlc17 compiler (based on a recent clang) to build OpenJDk on AIX , we run into various "warnings as errors".
>> Many of those are in the aix or ppc specific codebase and could be addressed by small adjustments.
>> A lot of those changes are in hotspot, some might be somewhere else in the OpenJDK C/C++ code.
>> With this PR we address only the platform dependent code changes.
>
> JoKern65 has updated the pull request incrementally with one additional commit since the last revision:
> 
>   followed the suggested changes

Looks okay to me, thanks for addressing the issues.

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Marked as reviewed by mbaesken (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/13953#pullrequestreview-1430464795