RFR: 8257733: Move module-specific data from make to respective module [v4]

[Alan Bateman]

On Fri, 15 Jan 2021 14:58:14 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> This PR is not stale; it's just still waiting for input from @AlanBateman.
>
> @magicus Can the CharacterDataXXX.template files move to src/java.base/share/classes/java/lang?

> @AlanBateman When I moved the charset templates, I found this gold nugget:
> 
> ```
> # Copy two Java files that need no preprocessing.
> $(SUPPORT_OUTPUTDIR)/gensrc/java.base/java/lang/%.java: $(CHARACTERDATA_TEMPLATES)/%.java.template
> 	$(call LogInfo, Generating $(@F))
> 	$(call install-file)
> 
> GENSRC_CHARACTERDATA += $(SUPPORT_OUTPUTDIR)/gensrc/java.base/java/lang/CharacterDataUndefined.java \
>     $(SUPPORT_OUTPUTDIR)/gensrc/java.base/java/lang/CharacterDataPrivateUse.java
> ```
> 
> What this means is that we have two "template" files that are just compiled as java files, but only after being copied to gensrc. :-) That definitely needs cleaning up, but this PR is large enough as it is, so I will not do it now.

Good find, surprised this wasn't spotted before now. We should create a separate issue to rename them and get rid of the copying in the make file.

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PR: https://git.openjdk.java.net/jdk/pull/1611