- Fixed vtables in Java.

- Removed UB in Java bytecode module.
- Recompiled virtual1-virtual4 with JDK 8.

Author: pkesseli

regression/cbmc-java/virtual1/A.class

@@ -16,6 +16,7 @@ class virtual1
   public static void main(String[] args)
   {
     A a=new A();
+    B b=new B();
     a.f();
   }
 }

regression/cbmc-java/virtual1/B.class

@@ -15,8 +15,9 @@ class virtual2
 {
   public static void main(String[] args)
   {
-    A a=new B();
-    a.f();
+    A a=new A();
+    A b=new B();
+    b.f();
   }
 }
 

regression/cbmc-java/virtual1/virtual1.class

@@ -1,22 +1,28 @@
 interface A
 {
   public void f();
-};
+}
 
 class B implements A
 {
   public void f()
   {
     assert false;
   }
-};
+}
+
+class C implements A
+{
+  public void f(){}
+}
 
 class virtual3
 {
   public static void main(String[] args)
   {
-    A a = new B();
-    a.f();
+    A b = new B();
+    A c = new C();
+    b.f();
   }
 }