Integrated: JDK-8306304: Fix xlc17 clang warnings in ppc and aix code

[JoKern65]

On Fri, 12 May 2023 12:01:43 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.

This pull request has now been integrated.

Changeset: c7951cf6
Author:    JoKern65 <Joachim.kern at sap.com>
Committer: Matthias Baesken <mbaesken at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/c7951cf674581ccd021e7403f5c3bd898e0542f4
Stats:     37 lines in 9 files changed: 8 ins; 0 del; 29 mod

8306304: Fix xlc17 clang warnings in ppc and aix code

Reviewed-by: erikj, tsteele, mbaesken

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PR: https://git.openjdk.org/jdk/pull/13953