RFR: 8266936: Add a finalization JFR event [v3]

[Markus Grönlund]

> Greetings,
> 
> Object.finalize() was deprecated in JDK9. There is an ongoing effort to replace and mitigate Object.finalize() uses in the JDK libraries; please see https://bugs.openjdk.java.net/browse/JDK-8253568 for more information. 
> 
> We also like to assist users in replacing and mitigating uses in non-JDK code.
> 
> Hence, this changeset adds a periodic JFR event to help identify which classes are overriding Object.finalize().
> 
> Thanks
> Markus

Markus Grönlund has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4731/files
  - new: https://git.openjdk.java.net/jdk/pull/4731/files/d4d154e8..58fc3f0a

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4731&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4731&range=01-02

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4731.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4731/head:pull/4731

PR: https://git.openjdk.java.net/jdk/pull/4731