Minor. Move 'done()' call into MultifileClassCodegen itself

compiler/backend/src/org/jetbrains/kotlin/codegen/ClassFileFactory.java

@@ -86,9 +86,6 @@ public class ClassFileFactory implements OutputFileCollection {
             isDone = true;
             Collection<PackageCodegen> packageCodegens = package2codegen.values();
             Collection<MultifileClassCodegen> multifileClassCodegens = multifileClass2codegen.values();
-            for (MultifileClassCodegen codegen : multifileClassCodegens) {
-                codegen.done();
-            }
             writeModuleMappings(packageCodegens, multifileClassCodegens);
         }
     }

compiler/backend/src/org/jetbrains/kotlin/codegen/MultifileClassCodegen.kt

@@ -115,6 +115,8 @@ class MultifileClassCodegen(
         if (!partFqNames.isEmpty()) {
             generateMultifileFacadeClass(generateCallableMemberTasks, partFqNames)
         }
+
+        done()
     }
 
     private fun generateCodeForSourceFiles(
@@ -289,7 +291,7 @@ class MultifileClassCodegen(
                 override fun generateKotlinMetadataAnnotation() = throw UnsupportedOperationException()
             }
 
-    fun done() {
+    private fun done() {
         classBuilder.done()
     }