RFR: 8333129: Move ShrinkHeapInSteps flag to Serial GC

[Kim Barrett]

On Thu, 30 May 2024 07:06:59 GMT, David Holmes <dholmes at openjdk.org> wrote:

> @zhengyu123 I don't think we can do this in quite such a direct way. This flag was added in JDK 9 under [JDK-8146436](https://bugs.openjdk.org/browse/JDK-8146436) and applied to all GC's AFAICS. Over time it seems to have been relegated to only working with SerialGC, but I can still find articles that reference it for GC tuning e.g.

The flag implementation was added in CardGeneration.  I'm not certain, but I think that class was only ever used
by Serial and CMS.

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PR Comment: https://git.openjdk.org/jdk/pull/19452#issuecomment-2138893102