FIR2IR fix enum special methods generation

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

@@ -1,8 +1,4 @@
 // TARGET_BACKEND: JVM
-// IGNORE_BACKEND_FIR: JVM_IR
-// FIR status: V
-// Caused by: java.util.NoSuchElementException: Sequence contains no element matching the predicate.
-// at org.jetbrains.kotlin.backend.jvm.lower.MappedEnumWhenLowering.visitClassNew(MappedEnumWhenLowering.kt:232)
 // FILE: E.java
 public enum E {
     A();