RFR 8183962: JVM_DoPrivileged does not find run method in default methods

[harold seigel]

Hi,

Please review this fix for JDK-8183962.  As suggested by Karen, the fix 
searches a class's super interfaces for  run() methods, if needed.  
Additionally, the fix checks if an abstract method was found, and if so, 
throws an exception.

Open Webrev: http://cr.openjdk.java.net/~hseigel/bug_8183962/webrev/

JBS Bug: https://bugs.openjdk.java.net/browse/JDK-8183962

The fix was tested with JCK Lang, VM, and API/java_lang, java_security, 
and javax_security tests, the JTreg hotspot, java/io, java/lang, 
java/util and other tests, the co-located NSK tests, RBT tests, and with 
JPRT.  (Thanks to Michael Rasmussen for the original test program.)

Thanks, Harold