Move JVM-specific annotations out of built-ins

Move 'volatile' and 'synchronized' to package 'kotlin' in stdlib. Also delete
'atomic', since its support was never implemented

libraries/stdlib/src/kotlin/JLangJVM.kt

@@ -25,3 +25,8 @@ public annotation class throws(vararg val exceptionClasses: Class<out Throwable>
     get() = (this as java.lang.Object).getClass() as Class<T>
 
 [Intrinsic("kotlin.javaClass.function")] fun <reified T> javaClass() : Class<T> = null as Class<T>
+
+Retention(RetentionPolicy.SOURCE)
+public annotation class volatile
+
+[Intrinsic("kotlin.synchronized")] public fun <R> synchronized(lock: Any, block: () -> R): R = block()