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

compiler/testData/codegen/light-analysis/properties/classObjectProperties.txt

@@ -1,7 +1,9 @@
+@kotlin.Metadata
 public final class ClassObjectPropertiesKt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
 }
 
+@kotlin.Metadata
 public final class Test {
     public final static field Companion: Test.Companion
     private final static field prop1: int
@@ -14,6 +16,7 @@ public final class Test {
     public method <init>(): void
 }
 
+@kotlin.Metadata
 public final static class Test/Companion {
     inner class Test/Companion
     private method <init>(): void