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

[Martin Doerr]

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)

We're not changing it for existing releases. I don't think non-LTS releases play a significant role regarding such compatibility. Next LTS is supposed to be JDK 25 (2025-09-16, https://www.java.com/releases/).

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PR Comment: https://git.openjdk.org/jdk/pull/14988#issuecomment-1742099242