RFR: 8314488: Compiling the JDK with C++17

[Kim Barrett]

On Fri, 15 Aug 2025 11:25:11 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> I think it is time to proceed with this change.

Agreed. I've been working on the associated style guide updates.  I'm going to leave this open for now in case
anyone wants to make any late comments here, and will withdraw this PR and replace with the real change soonish,
I hope.

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PR Comment: https://git.openjdk.org/jdk/pull/25992#issuecomment-3191338437