RFR: 8256916: Add JFR event for OutOfMemoryError

[Yasumasa Suenaga]

On Thu, 14 Jan 2021 14:40:34 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

> I don't have time to look at this now, I need to fix some high priority issues for JDK 16, but the problem is with C2. Several people have looked at this before.

I agree with you the problem is also with C2, however current JFR implementation has also problem in exception events - they hook throwing exceptions lesser than unified logging. It should be fixed.

As you can see in this PR, to move throwing events into HotSpot makes big change, so I think it is worth to work now without solving the problem with C2.
(We will be able to make lesser change when we want to solve the problem with C2 later.)

So I hope other JFR folks review this PR if you are busy.

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PR: https://git.openjdk.java.net/jdk/pull/1403