[jdk21u] RFR: 8313782: Add user-facing warning if THPs are enabled but cannot be used

Tue Nov 14 06:58:05 UTC 2023

Hi all,

This pull request contains a backport of [JDK-8313782](https://bugs.openjdk.org/browse/JDK-8313782), commit [dff99f7f](https://github.com/openjdk/jdk/commit/dff99f7f3d98372cb5bf8b1c2515b7628193cd2c) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Thomas Stuefe on 15 Aug 2023 and was reviewed by David Holmes and Stefan Johansson.

Thanks!

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Commit messages:
 - Backport dff99f7f3d98372cb5bf8b1c2515b7628193cd2c

Changes: https://git.openjdk.org/jdk21u/pull/357/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=357&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313782
  Stats: 13 lines in 1 file changed: 5 ins; 3 del; 5 mod
  Patch: https://git.openjdk.org/jdk21u/pull/357.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/357/head:pull/357

PR: https://git.openjdk.org/jdk21u/pull/357