Generate ACC_NATIVE for external

compiler/backend/src/org/jetbrains/kotlin/codegen/AnnotationCodegen.java

@@ -63,8 +63,7 @@ public abstract class AnnotationCodegen {
     public static final List<JvmFlagAnnotation> METHOD_FLAGS = Arrays.asList(
             new JvmFlagAnnotation("kotlin.jvm.Strictfp", Opcodes.ACC_STRICT),
             new JvmFlagAnnotation("kotlin.jvm.Synchronized", Opcodes.ACC_SYNCHRONIZED),
-            new JvmFlagAnnotation("kotlin.jvm.native", Opcodes.ACC_NATIVE),
-            new JvmFlagAnnotation("kotlin.external", Opcodes.ACC_NATIVE)
+            new JvmFlagAnnotation("kotlin.jvm.native", Opcodes.ACC_NATIVE)
     );
 
     private static final AnnotationVisitor NO_ANNOTATION_VISITOR = new AnnotationVisitor(Opcodes.ASM5) {};

compiler/backend/src/org/jetbrains/kotlin/codegen/AsmUtil.java

@@ -192,6 +192,10 @@ public class AsmUtil {
             }
         }
 
+        if (functionDescriptor.getOriginal().isExternal()) {
+            flags |= Opcodes.ACC_NATIVE;
+        }
+
         if (AnnotationUtilKt.isPlatformStaticInCompanionObject(functionDescriptor)) {
             // Native method will be a member of the class, the companion object method will be delegated to it
             flags &= ~Opcodes.ACC_NATIVE;