[Tests] Migrate backend-independent tests from native to compiler/testData.

^KT-65979

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

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the LICENSE file.
+ */
+// !LANGUAGE: -ProhibitComparisonOfIncompatibleEnums
+// WITH_STDLIB
+
+import kotlin.test.*
+
+enum class EnumA {
+    A, B
+}
+
+enum class EnumB {
+    B
+}
+
+fun box(): String {
+    if (!(EnumA.A == EnumA.A))
+        return "FAIL: A must equal A"
+    if (EnumA.A == EnumA.B)
+        return "FAIL: A.A must not equal A.B"
+    if (EnumA.A == EnumB.B)
+        return "FAIL: A.A must not equal B.B"
+
+    return "OK"
+}