RFR 8165634: Support multiple --add-module options on the command line

[Alan Bateman]

On 08/09/2016 14:23, harold seigel wrote:
> Hi,
>
> Please review this fix for JDK-8165634.  The fix changes the 
> --add-modules option from being a 'last one wins' option to a 
> cumulative one.  With this change, if multiple --add-modules options 
> are specified, the VM accumulates all the options' values, instead of 
> ignoring all but the last option's value.  The --add-modules values 
> are reported back to the JDK as properties using the 
> Arguments::create_numbered_property() function.
>
> JBS Bug: https://bugs.openjdk.java.net/browse/JDK-8165634
>
> Open webrevs:
>
>    http://cr.openjdk.java.net/~hseigel/bug_8165634.hs/
>
>    http://cr.openjdk.java.net/~hseigel/bug_8165634.jdk/
This drops a dup check from addExtraReads that I assume should not be in 
this patch.

The rest of the jdk changes look okay. One suggestion for 
getExtraAddModules is to just return Collections.emptySet or Set.of when 
the first getAndRemoveProperty returns null. We're in the interpreter 
during this early start so everything counts.

-Alan