RFR: 8314488: Compile the JDK as C++17 [v2]

[Kim Barrett]

On Fri, 15 Dec 2023 13:52:28 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> In case you want to update the required compiler versions as part of this PR: We have tested -TOOLCHAIN_MINIMUM_VERSION_xlc="16.1.0.0011" +TOOLCHAIN_MINIMUM_VERSION_xlc="17.1.1.4" (Already discussed with Kim.)

Also discussed with the aix-ppc port maintainers at IBM.

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PR Comment: https://git.openjdk.org/jdk/pull/14988#issuecomment-1864380101