Review request for JDK-8142864: Raw types warning in WeakValueCache

[Hannes Wallnoefer]

Please review JDK-8142864: Raw types warning in WeakValueCache:

http://cr.openjdk.java.net/~hannesw/8142864/webrev/

This removes a warning in WeakValueCache.java, and I also reduced 
methods by combining code as suggested by Attila.

Furthermore I renamed method in isWrappedPrimitiveAndObject in 
ScriptRuntime.java to isPrimitiveAndObject because the primitives are 
not wrapped (at least not in the JavaScript meaning of the word).

Thanks,
Hannes