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

compiler/testData/codegen/light-analysis/reflection/enclosing/lambdaInClassObject.txt

@@ -1,7 +1,9 @@
+@kotlin.Metadata
 public final class LambdaInClassObjectKt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
 }
 
+@kotlin.Metadata
 public final class O {
     public final static field Companion: O.Companion
     private final static @org.jetbrains.annotations.NotNull field f: kotlin.jvm.functions.Function0
@@ -9,6 +11,7 @@ public final class O {
     public method <init>(): void
 }
 
+@kotlin.Metadata
 public final static class O/Companion {
     inner class O/Companion
     private method <init>(): void