convert to instance/move instance: support default methods in interfaces for java 8 (IDEA-154833)

java/java-tests/testData/refactoring/convertToInstance8Method/VisibilityConflict.java

@@ -0,0 +1,11 @@
+class Test {
+  {
+    foo(new Bar());
+  }
+  private static void <caret>foo(Bar b){}
+
+}
+
+class Bar {
+
+}