Tests: fix stdlib declarations in IR interpreter test data

Fix some unresolved supertypes. This is necessary to be able to enable
IR fake override builder by default (KT-61514), because it traverses all
supertypes and asserts that they're classes, so that it can build fake
overrides for declarations from there. Without this change, for example
`IrFakeOverrideBuilder.buildFakeOverridesForClass` would crash.

compiler/testData/ir/interpreter/helpers/Collections.kt

@@ -12,7 +12,7 @@ internal object EmptyIterator : ListIterator<Nothing> {
     override fun previous(): Nothing = throw NoSuchElementException()
 }
 
-internal object EmptyList : List<Nothing>, Serializable, RandomAccess {
+internal object EmptyList : List<Nothing>, java.io.Serializable, RandomAccess {
     private const val serialVersionUID: Long = -7390468764508069838L
 
     override fun equals(other: Any?): Boolean = other is List<*> && other.isEmpty()