Add comment to auto-generated interop stubs

Interop/StubGenerator/src/main/kotlin/org/jetbrains/kotlin/native/interop/gen/jvm/StubGenerator.kt

@@ -894,6 +894,9 @@ class StubGenerator(
 
         out("")
 
+        out("// NOTE THIS FILE IS AUTO-GENERATED")
+        out("")
+
         val context = object : StubGenerationContext {
             val topLevelDeclarationLines = mutableListOf<String>()
 
@@ -942,6 +945,9 @@ class StubGenerator(
         }
         out("")
 
+        out("// NOTE THIS FILE IS AUTO-GENERATED")
+        out("")
+
         bridges.nativeLines.forEach {
             out(it)
         }