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

compiler/testData/codegen/light-analysis/callableReference/function/local/captureOuter.txt

@@ -1,7 +1,9 @@
+@kotlin.Metadata
 public final class CaptureOuterKt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
 }
 
+@kotlin.Metadata
 public final class Outer {
     private final @org.jetbrains.annotations.NotNull field result: java.lang.String
     inner class Outer/Inner
@@ -9,6 +11,7 @@ public final class Outer {
     public final @org.jetbrains.annotations.NotNull method getResult(): java.lang.String
 }
 
+@kotlin.Metadata
 public final class Outer/Inner {
     synthetic final field this$0: Outer
     inner class Outer/Inner