RFR: 8314488: Compile the JDK as C++17

[Kim Barrett]

On Mon, 24 Jul 2023 01:41:16 GMT, Julian Waters <jwaters at openjdk.org> wrote:

> Implementation of [JEP draft: Compile the JDK as C++17](https://bugs.openjdk.org/browse/JDK-8310260)

This change needs to be motivated.  One way to do that would be to file CRs to
change the style guide to permit various features.  Label them with `cpp17`.
Discuss them prior to making the language change, describing why they are
important.  A sufficient set of such provides an argument for making the
language change.

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PR Comment: https://git.openjdk.org/jdk/pull/14988#issuecomment-1684876746