Add KClass.isValue to kotlin-reflect

#KT-44782 Fixed

libraries/stdlib/jvm/src/kotlin/reflect/KClass.kt

@@ -133,6 +133,12 @@ public actual interface KClass<T : Any> : KDeclarationContainer, KAnnotatedEleme
     @SinceKotlin("1.4")
     public val isFun: Boolean
 
+    /**
+     * `true` if this class is a value class.
+     */
+    @SinceKotlin("1.5")
+    public val isValue: Boolean
+
     /**
      * Returns `true` if this [KClass] instance represents the same Kotlin class as the class represented by [other].
      * On JVM this means that all of the following conditions are satisfied: