Add a cache to record which source has called `System::setSecurityManager` and only print out warning lines once for each.
------------- Commit messages: - renaming variables, two callers in test - one warning for each caller Changes: https://git.openjdk.java.net/jdk17/pull/166/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk17&pr=166&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8269543 Stats: 47 lines in 2 files changed: 34 ins; 0 del; 13 mod Patch: https://git.openjdk.java.net/jdk17/pull/166.diff Fetch: git fetch https://git.openjdk.java.net/jdk17 pull/166/head:pull/166 PR: https://git.openjdk.java.net/jdk17/pull/166
