Kapt3: Write stub class files with metadata (needed for incremental compilation)

compiler/testData/codegen/light-analysis/classes/classObjectsWithParentClasses.txt

@@ -1,7 +1,9 @@
+@kotlin.Metadata
 public final class ClassObjectsWithParentClassesKt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
 }
 
+@kotlin.Metadata
 public class Test {
     public final static field Companion: Test.Companion
     inner class Test/Companion
@@ -11,12 +13,14 @@ public class Test {
     public final @org.jetbrains.annotations.NotNull method test(): Test.InnerClass
 }
 
+@kotlin.Metadata
 public final static class Test/Companion {
     inner class Test/Companion
     private method <init>(): void
     public final @org.jetbrains.annotations.NotNull method testStatic(@org.jetbrains.annotations.NotNull p0: Test.InnerClass): Test.NotInnerClass
 }
 
+@kotlin.Metadata
 public class Test/InnerClass {
     synthetic final field this$0: Test
     private final field value: int
@@ -25,6 +29,7 @@ public class Test/InnerClass {
     public final method getValue(): int
 }
 
+@kotlin.Metadata
 public static class Test/NotInnerClass {
     private final field value: int
     inner class Test/NotInnerClass