RFR: 8325403: Add SystemGC JMH benchmarks

[Stefan Johansson]

On Fri, 9 Feb 2024 11:53:17 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Since all of them are related to system-gc, does it make sense to put them inside a folder, `system_gc`, and a text file containing info on how to run them altogether?

I had similar thoughts and I'm not against it. Just thought I'd wait and see what comments I got around the structure. Need to double check that using the folder as regexp would work to get them all in that case. Right now you can do `java -jar benchmarks.jar SystemGC` to run them all. 

I've tried to make sure that the default settings should be good, so not sure what should go into the text file.

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PR Comment: https://git.openjdk.org/jdk/pull/17784#issuecomment-1935813588