If JFR writes redundant or unreferenced constant pool data, the recording file becomes unnecessary large, but still pass all the unit tests we have today.

With the introduction scrubbing JDK-8271232, the JFR parser contains a mechanism that tracks all references, so it can clean out duplicated or unreferenced constants.

We should add a unit tests that scrubs a recording without removing any events. If the file size can be reduced more than 2-5%, the test should fail.