RFR: 8292916: Streamline LoaderConstraint purging

Thu Aug 25 15:35:08 UTC 2022

The code to purge loader constraints walks through the class loader list of an unloaded class, and then asserts that the there are no leftovers. It can just directly remove the list of loaders without that walk.

Also I left the variable name 'probe' to help with diffs for [JDK-8291969](https://bugs.openjdk.org/browse/JDK-8291969) a little, but it's a bad variable name.

Tested with tier1-3 which contains jck tests.

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Commit messages:
 - 8292916: Streamline LoaderConstraint purging

Changes: https://git.openjdk.org/jdk/pull/10023/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10023&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292916
  Stats: 54 lines in 1 file changed: 10 ins; 12 del; 32 mod
  Patch: https://git.openjdk.org/jdk/pull/10023.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10023/head:pull/10023

PR: https://git.openjdk.org/jdk/pull/10023