JVM_IR: move serialized IR to a separate annotation

libraries/stdlib/jvm/runtime/kotlin/jvm/internal/SerializedIr.kt

@@ -0,0 +1,17 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.jvm.internal
+
+/**
+ * This annotation is used to store serialized IR data inside classfiles.
+ */
+@Retention(AnnotationRetention.BINARY)
+@Target(AnnotationTarget.CLASS)
+@SinceKotlin("1.6")
+annotation class SerializedIr(
+    @get:JvmName("b")
+    val bytes: Array<String> = []
+)