Two suggested langtools backports to OpenJDK 6

[Joe Darcy]

joe.darcy at oracle.com wrote:
> Hello.
>
> I suggest the following two langtools fixes be backported from JDK 7 
> to OpenJDK 6:
>
>    6507024 java/compiler: unchecked conversion between arrays fails 
> after capture conversion
>    http://hg.openjdk.java.net/jdk7/jdk7/langtools/rev/6e9a43815df7

A follow-up, this patch applies cleanly and all regression tests, old 
and new, pass with the change.

Pending Kelly's approval, it is ready to push :-)

>
>    6999460 java/compiler: Glassfish build with JDK 6 / 7 is 5x-10x 
> slower on Windows than on Linux
>    http://hg.openjdk.java.net/jdk7/jdk7/langtools/rev/a8d3eed8e247
>
> Fixes for these two bugs are already in the proprietary 6 update train.
>  

On the other hand, some porting of the JDK 7 patch for 6999460 needs to 
be done before it can be applied to OpenJDK 6.

-Joe