Report experimental diagnostics on inaccessible (wrt SinceKotlin) API

If a declaration is annotated both with SinceKotlin and WasExperimental
and the SinceKotlin version makes it inaccessible, the experimental
checker must regard it as experimental, with markers specified in the
WasExperimental annotation arguments. So only errors/warnings about the
experimentality are going to be reported in this case, and no error that
the declaration is unavailable because of a low API version

libraries/stdlib/src/kotlin/annotations/Experimental.kt

@@ -52,7 +52,7 @@ annotation class UseExperimental(
 )
 
 
-@Target(CLASS, PROPERTY, CONSTRUCTOR, FUNCTION)
+@Target(CLASS, PROPERTY, CONSTRUCTOR, FUNCTION, TYPEALIAS)
 @Retention(BINARY)
 internal annotation class WasExperimental(
     vararg val markerClass: KClass<out Annotation>