Remove some legacy codegen tests, move some to generated

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

@@ -0,0 +1,32 @@
+// WITH_RUNTIME
+
+enum class IssueState {
+    DEFAULT,
+    FIXED {
+        override fun ToString() = "K"
+    };
+
+    open fun ToString(): String = "O"
+}
+
+fun box(): String {
+    val field = IssueState::class.java.getField("FIXED")
+
+    val typeName = field.type.name
+    if (typeName != "IssueState") return "Fail type name: $typeName"
+
+    val className = field.get(null).javaClass.name
+    if (className != "IssueState\$FIXED") return "Fail class name: $className"
+
+    val classLoader = IssueState::class.java.classLoader
+    classLoader.loadClass("IssueState\$FIXED")
+    try {
+        classLoader.loadClass("IssueState\$DEFAULT")
+        return "Fail: no class should have been generated for DEFAULT"
+    }
+    catch (e: Exception) {
+        // ok
+    }
+
+    return IssueState.DEFAULT.ToString() + IssueState.FIXED.ToString()
+}