Map jet.Hashable to java.lang.Object, to avoid NoClassDefFound exceptions

core/descriptor.loader.java/src/org/jetbrains/jet/lang/resolve/java/mapping/JavaToKotlinClassMapBuilder.java

@@ -43,6 +43,7 @@ public abstract class JavaToKotlinClassMapBuilder {
         register(Enum.class, kotlinBuiltIns.getEnum());
         register(Annotation.class, kotlinBuiltIns.getAnnotation());
         register(Deprecated.class, kotlinBuiltIns.getDeprecatedAnnotation(), Direction.JAVA_TO_KOTLIN);
+        register(Object.class, kotlinBuiltIns.getHashable(), Direction.KOTLIN_TO_JAVA);
 
         register(Iterable.class, kotlinBuiltIns.getIterable(), kotlinBuiltIns.getMutableIterable());
         register(Iterator.class, kotlinBuiltIns.getIterator(), kotlinBuiltIns.getMutableIterator());

core/descriptors/src/org/jetbrains/jet/lang/types/lang/KotlinBuiltIns.java

@@ -333,6 +333,11 @@ public class KotlinBuiltIns {
         return getBuiltInClassByName("Number");
     }
 
+    @NotNull
+    public ClassDescriptor getHashable() {
+        return getBuiltInClassByName("Hashable");
+    }
+
     @NotNull
     public ClassDescriptor getUnit() {
         return getBuiltInClassByName("Unit");