rfr [lworld] change the verifier to allow array covariance

[Harold Seigel]

Hi,

Please review this small LW2 change to the verifier to allow 
assignability of an array of a value type to both an array of 
java.lang.Object's and an array of an interface type.

Open Webrev: 
http://cr.openjdk.java.net/~hseigel/lworld_array_cov/webrev/index.html

A future improvement to this change would be to rename the test cases 
and re-write them in Java.

The change was tested with tiers 1,2 on multiple platforms and tiers 3-5 
on Linux.

Thanks, Harold