check for abstract method implemented optimized: don't go through hierarchy if superClass is not abstract and there is no interfaces, would also fix asm implementations with 'broken' erasures inside

java/java-tests/testSrc/com/intellij/codeInsight/daemon/LightAdvHighlightingJdk6Test.java

@@ -69,4 +69,7 @@ public class LightAdvHighlightingJdk6Test extends LightDaemonAnalyzerTestCase {
   public void testUnhandledErrorsFromEnumConstructors() {
     doTest(true, false);
   }
+  public void testSkipAbstractMethodsIfTheyMustBeDeclaredInNonAbstractSuperclass() {
+    doTest(false, false);
+  }
 }