RFR: JDK-8189094: Change required boot jdk to JDK 9

[Alan Bateman]

On 17/10/2017 17:53, Martin Buchholz wrote:
> I tried to figure out how this patch actually works.  At first I 
> thought we were "shading" (renaming all the packages in the source 
> files) but now I think we're merely renaming the modules by appending 
> ".interim" to the names.  But that looks like cheating to me - we're 
> not allowed to have multiple modules containing the same packages, but 
> are getting away with it because the runtime happens to never look at 
> the (unused) original jdk9 modules?
The patch uses `--limit-modules` to limit the observability of modules 
and prevent the jdk.compiler module in the boot JDK from being resolved. 
If the boot JDK were to resolve jdk.compiler (in its own run-time image) 
and jdk.compiler.interim on the module path then you would end up with 
two modules containing the same classes mapped to the app class loader, 
can't do that.

-Alan
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