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

compiler/testData/codegen/light-analysis/classes/sealedInSameFile.txt

@@ -1,53 +1,65 @@
+@kotlin.Metadata
 public abstract class A {
     inner class A/C
     private method <init>(): void
     private method <init>(p0: int): void
 }
 
+@kotlin.Metadata
 public final static class A/C {
     inner class A/C
     public method <init>(): void
 }
 
+@kotlin.Metadata
 public final class B {
     public method <init>(): void
 }
 
+@kotlin.Metadata
 public final class D {
     public method <init>(): void
 }
 
+@kotlin.Metadata
 public final class E {
     public method <init>(): void
     public method <init>(p0: int): void
 }
 
+@kotlin.Metadata
 public final class Q {
     public method <init>(): void
 }
 
+@kotlin.Metadata
 public final class S {
     public final static field INSTANCE: S
     private method <init>(): void
 }
 
+@kotlin.Metadata
 public final class SealedInSameFileKt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
 }
 
+@kotlin.Metadata
 public final class T {
     public final static field INSTANCE: T
     private method <init>(): void
 }
 
+@kotlin.Metadata
 public abstract class X {
     private method <init>(): void
 }
 
+@kotlin.Metadata
 public abstract class Y {
     private method <init>(): void
 }
 
+@kotlin.Metadata
 public abstract class Z {
     private method <init>(): void
 }