Cleanup after review

+ stub builder test for multifile class

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/kotlin/header/ReadKotlinClassHeaderAnnotationVisitor.java

@@ -95,7 +95,6 @@ public class ReadKotlinClassHeaderAnnotationVisitor implements AnnotationVisitor
         return headerKind == CLASS ||
                headerKind == PACKAGE_FACADE ||
                headerKind == FILE_FACADE ||
-               headerKind == MULTIFILE_CLASS ||
                headerKind == MULTIFILE_CLASS_PART;
     }
 

core/runtime.jvm/src/kotlin/jvm/internal/KotlinMultifileClass.java

@@ -24,5 +24,4 @@ public @interface KotlinMultifileClass {
     int abiVersion();
 
     String[] filePartClassNames();
-    String[] data();
 }