Review request on the optional modules support

[Mandy Chung]

  On 09/15/11 08:17, Mandy Chung wrote:
>
> * Class.getClassLoader for system classes returns the boot
>   loader in module mode and returns null in legacy mode.
>

I would have to back out this Class.getClassLoader change because this 
requires
more analysis and modification to the implementation.  I'll look into 
this together
with the legacy mode support.

With more testing and investigation, there are places  in the JDK that
rely on null class loader for its implementation details.  Also there is
bootstrapping issue that we have to determine when the boot loader
can be initialized.

Final webrev:
    http://cr.openjdk.java.net/~mchung/jigsaw/webrevs/optional-modules.03/

Mandy