[lworld] RFR: 8372515: [lworld] Plumb in javac flags for compiling with preview mode [v2]

[David Beaumont]

On Wed, 26 Nov 2025 20:02:07 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> src/jdk.compiler/share/classes/com/sun/tools/javac/file/JRTIndex.java line 305:
>> 
>>> 303:     }
>>> 304: 
>>> 305:     private final FileSystemResources sharedResources;
>> 
>> The fields of JRTIndex should be at the top of the class.
>> Fields, constructors, static methods, the rest.  
>> There's some debate about where nested classes go (I say at the end).
>
> It is worth saying something about the values that are kept here. 
> It looks like a singleton but is per JRTIndex and preview.

I'll move the field constructor and close method, but leave the rest to avoid churn.

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PR Review Comment: https://git.openjdk.org/valhalla/pull/1761#discussion_r2622682829