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

Thu Jun 26 02:14:16 UTC 2025

I'm hijacking the PR mechanism as a way to discuss new C++17 features that can
be more easily structured and captured than bare email. Once discussion
settles down I'll turn the results into HotSpot Style Guide changes. I don't
intend to integrate any version of this document to the OpenJDK repository.

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Commit messages:
 - initial draft

Changes: https://git.openjdk.org/jdk/pull/25992/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25992&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314488
  Stats: 1113 lines in 1 file changed: 1113 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/25992.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25992/head:pull/25992

PR: https://git.openjdk.org/jdk/pull/25992