Value classes: Allow unsigned arrays in annotations

including varargs, apparently.
So, we allow unsigned types and unsigned arrays in annotations,
but disallow user-defined inline classes.
 #KT-23816 Fixed

compiler/testData/diagnostics/testsWithUnsignedTypes/allowedVarargsOfUnsignedTypes.kt

@@ -7,6 +7,6 @@ fun ulong(vararg a: ULong) {}
 
 class ValueParam(vararg val a: ULong)
 
-annotation class Ann(vararg val a: <!INVALID_TYPE_OF_ANNOTATION_MEMBER!>UInt<!>)
+annotation class Ann(vararg val a: UInt)
 
 fun array(<!FORBIDDEN_VARARG_PARAMETER_TYPE!>vararg<!> a: UIntArray) {}