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

compiler/testData/codegen/light-analysis/bridges/propertyInConstructor.txt

@@ -1,8 +1,10 @@
+@kotlin.Metadata
 public interface A {
     public abstract method getX(): java.lang.Object
     public abstract method setX(p0: java.lang.Object): void
 }
 
+@kotlin.Metadata
 public final class B {
     private @org.jetbrains.annotations.NotNull field x: java.lang.String
     public method <init>(@org.jetbrains.annotations.NotNull p0: java.lang.String): void
@@ -12,6 +14,7 @@ public final class B {
     public synthetic method setX(p0: java.lang.Object): void
 }
 
+@kotlin.Metadata
 public final class PropertyInConstructorKt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
 }