[FIR] Support static getters along with fake Enum.entries declaration in FIR

#KT-48872

compiler/testData/ir/irText/classes/enumEntries.kt.txt

@@ -0,0 +1,24 @@
+enum class MyEnum : Enum<MyEnum> {
+  private constructor() /* primary */ {
+    super/*Enum*/<MyEnum>()
+    /* <init>() */
+
+  }
+
+  Ok = MyEnum()
+
+  Nope = MyEnum()
+
+  fun values(): Array<MyEnum> /* Synthetic body for ENUM_VALUES */
+
+  fun valueOf(value: String): MyEnum /* Synthetic body for ENUM_VALUEOF */
+
+  val entries: EnumEntries<MyEnum>
+    get
+
+}
+
+@OptIn(markerClass = [ExperimentalStdlibApi::class])
+fun box(): EnumEntries<MyEnum> {
+  return <get-entries>()
+}