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/Maps.kt

@@ -5,7 +5,7 @@ package kotlin.collections
 
 import kotlin.sequences.*
 
-private object EmptyMap : Map<Any?, Nothing>, Serializable {
+private object EmptyMap : Map<Any?, Nothing>, java.io.Serializable {
     private const val serialVersionUID: Long = 8246714829545688274
 
     override fun equals(other: Any?): Boolean = other is Map<*, *> && other.isEmpty()