Review request for 8026167: Class cache/reuse of 'eval' scripts results in ClassCastException in some cases.

[A. Sundararajan]

Please review http://cr.openjdk.java.net/~sundar/8026167/webrev.01/

PS. I changed to use unique eval id instead of caller Class (as in 
webrev.00) and adjusted .EXPECTED to avoid full URL of evals

Thanks
-Sundar