RFR: Merge jdk17

[Jesper Wilhelmsson]

Forwardport JDK 17 -> JDK 18

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Commit messages:
 - Merge
 - 8268635: Corrupt oop in ClassLoaderData
 - 8269276: Additional tests for MessageDigest with different providers

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.java.net/jdk/pull/4802/files
  Stats: 29 lines in 1 file changed: 14 ins; 2 del; 13 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4802.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4802/head:pull/4802

PR: https://git.openjdk.java.net/jdk/pull/4802