RFR 8203033: [Testbug] vmTestbase/nsk/jdi/TypeComponent/isSynthetic/issynthetic002/TestDescription.java fails with nestmates

[Daniil Titov]

Please review the change that fixes vmTestbase/nsk/jdi/TypeComponent/isSynthetic/issynthetic002/TestDescription.java test. 

The fix uses the implementation of a parametrized interface in the test class to trigger the compiler to generate a synthetic bridge method. The test works fine in both nestmates and jdk/jdk repositories.

Issue: https://bugs.openjdk.java.net/browse/JDK-8203033 
Webrev: http://cr.openjdk.java.net/~dtitov/8203033/webrev.02

Thanks,
Daniil