Mark KAnnotatedElement.hasAnnotation as experimental

#KT-29041 Fixed

core/reflection.jvm/src/kotlin/reflect/full/KAnnotatedElements.kt

@@ -1,20 +1,10 @@
 /*
- * Copyright 2010-2016 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
  */
 
 @file:JvmName("KAnnotatedElements")
+
 package kotlin.reflect.full
 
 import kotlin.reflect.*
@@ -24,12 +14,13 @@ import kotlin.reflect.*
  */
 @SinceKotlin("1.1")
 inline fun <reified T : Annotation> KAnnotatedElement.findAnnotation(): T? =
-        @Suppress("UNCHECKED_CAST")
-        annotations.firstOrNull { it is T } as T?
+    @Suppress("UNCHECKED_CAST")
+    annotations.firstOrNull { it is T } as T?
 
 /**
- * Returns true if this element is annotated with [T], false otherwise
+ * Returns true if this element is annotated with an annotation of type [T].
  */
-@SinceKotlin("1.4")
+@ExperimentalStdlibApi
+@SinceKotlin("1.3")
 inline fun <reified T : Annotation> KAnnotatedElement.hasAnnotation(): Boolean =
-        findAnnotation<T>() != null
+    findAnnotation<T>() != null