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

compiler/testData/codegen/light-analysis/toArray/toArrayShouldBePublic.txt

@@ -1,7 +1,9 @@
+@kotlin.Metadata
 public final class BoxKt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
 }
 
+@kotlin.Metadata
 public class test/SingletonCollection {
     private final field size: int
     private final field value: java.lang.Object
@@ -13,6 +15,7 @@ public class test/SingletonCollection {
     public final @org.jetbrains.annotations.NotNull method toArray(@org.jetbrains.annotations.NotNull p0: java.lang.Object[]): java.lang.Object[]
 }
 
+@kotlin.Metadata
 public final class test2/DerivedSingletonCollection {
     public method <init>(p0: java.lang.Object): void
 }