7336: Add support for new JFR event systemGC

[jpbempel]

SystemGC event brings stacktrace when a System.gc() is triggered
We can then correlate with GarbageCollection event with "System.gc()"
cause to this new event to be able to show stacktrace in Stacktrace
View/Flameview

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Progress

• Commit message must refer to an issue
• Change must be properly reviewed

Issue

• JMC-7336: Add support for new JFR event systemGC

Reviewers

• Alex Macdonald (@aptmac - Committer)
• Marcus Hirt (@thegreystone - Reviewer)

Reviewing

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Checkout this PR locally:
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$ git checkout pull/307

Update a local copy of the PR:
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$ git pull https://git.openjdk.java.net/jmc pull/307/head

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$ git pr checkout 307

View PR using the GUI difftool:
$ git pr show -t 307

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[bridgekeeper]

👋 Welcome back jpbempel! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[mlbridge]

Webrevs

• 01: Full - Incremental (99a7aad9)
• 00: Full (3b0f0b3a)

[openjdk]

@jpbempel This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

7336: Add support for new JFR event systemGC

Reviewed-by: aptmac, hirt

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 2 new commits pushed to the master branch:

• d05f377: 7378: Update platform to 2021-06
• 341f3d5: 7338: Add parser support for frame types generated by async-profiler

Please see this link for an up-to-date comparison between the source branch of this pull request and the master branch.
As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[jpbempel]

/integrate

[openjdk]

Going to push as commit a0cbc98.
Since your change was applied there have been 2 commits pushed to the master branch:

• d05f377: 7378: Update platform to 2021-06
• 341f3d5: 7338: Add parser support for frame types generated by async-profiler

Your commit was automatically rebased without conflicts.

[openjdk]

@jpbempel Pushed as commit a0cbc98.

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