Fix memory leak by disposing a classloader. The real issue though is located in TypeInfoParser, that has WeakHashMap with values referencing keys.

compiler/backend/src/org/jetbrains/jet/codegen/GeneratedClassLoader.java

@@ -6,7 +6,7 @@ import org.jetbrains.annotations.NotNull;
 * @author yole
 */
 public class GeneratedClassLoader extends ClassLoader {
-    private final ClassFileFactory state;
+    private ClassFileFactory state;
 
     public GeneratedClassLoader(@NotNull ClassFileFactory state) {
         this(state, GeneratedClassLoader.class.getClassLoader());
@@ -26,4 +26,8 @@ public class GeneratedClassLoader extends ClassLoader {
         }
         return super.findClass(name);
     }
+
+    public void dispose() {
+        state = null;
+    }
 }