[IR] Fix serialization of ENUM_SPECIAL members

compiler/testData/codegen/box/enum/enumMultiModule.kt

@@ -0,0 +1,22 @@
+// WITH_RUNTIME
+// MODULE: lib
+// FILE: common.kt
+
+enum class FooEnum(val s: String) {
+    O("O"),
+    FAIL("FAIL"),
+    K("K");
+}
+
+
+// MODULE: bar(lib)
+// FILE: second.kt
+
+fun bar(): String = FooEnum.valueOf("O").s + FooEnum.values()[2].s
+
+// MODULE: main(bar)
+// FILE: main.kt
+
+fun box(): String {
+    return bar()
+}