Two suggested langtools backports to OpenJDK 6

[joe.darcy at oracle.com]

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

    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.

-Joe