RFR(S) 8139069: JVM should throw ClassFormatError for <init> methods in interfaces

[harold seigel]

Hi,

Please review this small change to fix bug 8139069.

Recent proposed JVM-9 Spec changes (JDK-8122940 
<https://bugs.openjdk.java.net/browse/JDK-8122940>) require throwing 
ClassFormatError exceptions if an interface contains a method named 
<init>.  This fix implements that change.  It undoes the change for 
JDK-8135265 <https://bugs.openjdk.java.net/browse/JDK-8135265>.

Open webrev: http://cr.openjdk.java.net/~hseigel/bug_8139069/

JBS Bug: https://bugs.openjdk.java.net/browse/JDK-8139069

The fix was tested with JCK Lang, VM, and API java_lang tests, the UTE 
quick and split verifier tests, and the hotspot, JDK vm, java/io, 
java/lang, and java/util JTreg tests, and the tests included in this RFR.

Thanks, Harold