RFR: 8295653: Add a graph of the sealed class hierarchy for marked classes [v2]

[Magnus Ihse Bursie]

On Mon, 24 Oct 2022 20:11:51 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> make/jdk/src/classes/build/tools/taglet/SealedGraph.java line 49:
>> 
>>> 47: public final class SealedGraph implements Taglet {
>>> 48:     private static final String sealedGraphDotPath =
>>> 49:             System.getProperty("sealedGraphDotPath");
>> 
>> The naming and use is slightly off here.
>> 
>> 1. It names the _directory_ in which the graph `.dot` file will be placed. It's not a path for the `.dot` file itself.
>> 2. it does double-duty as the equivalent of `enableModuleGraph` in the module graphs world.
>
> Would `sealedDotOutputDir` be ok? I think 2. will kind of follow from the fact that it is specified. Otherwise we could do like `enableSealedDotOutputInDir` but I think that's getting too verbose. And having two different properties just because of naming makes no sense, since then we need to start checking that they are consistent.

I went with `sealedDotOutputDir`. Hope it's okay.

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PR: https://git.openjdk.org/jdk/pull/10761