K1: Add test for compatibility check of Enum.entries

Basically, the test checks that adding Enum.entries feature doesn't
break the existing code where it clashes with the user-defined "entries"
declaration; it's better to have a black-box test to be sure
that the compiler doesn't invoke something different at runtime

 The test covers KT-53153 and KT-56587

Merge-request: KT-MR-9798
Merged-by: Michail Zarečenskij <Mikhail.Zarechenskiy@jetbrains.com>

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

@@ -0,0 +1,89 @@
+// !LANGUAGE: +EnumEntries
+// IGNORE_BACKEND: JS, JVM, JS_IR, JS_IR_ES6
+// IGNORE_BACKEND_K2: JVM_IR, NATIVE
+// IGNORE_LIGHT_ANALYSIS
+// FULL_JDK
+// WITH_STDLIB
+
+package pckg
+
+import kotlin.test.assertEquals
+
+enum class EBasic {
+    A0;
+}
+
+enum class E0 {;
+    companion object {
+        val entries = "OK"
+    }
+}
+
+object Shadowing {
+    val entries = "OK"
+
+    enum class E0 {
+        E;
+
+        fun test() = entries
+    }
+}
+
+enum class E01 {;
+    object entries {
+        override fun toString(): String {
+            return "OK"
+        }
+    }
+}
+
+enum class E02(val entries: String) {
+    E("OK");
+    fun test() = entries // check whether this entries is referenced to ctor parameter
+}
+
+var e03Res: String? = null
+
+enum class E03 {
+    E("OK");
+
+    constructor(entries: String) {
+        e03Res = entries
+    }
+}
+
+enum class E04 {
+    E;
+    val entries = "OK"
+    fun test() = entries
+}
+
+// This case doesn't work in KJS/IR: KT-58396
+interface I05 {
+    val entries: String
+        get() = "OK"
+}
+
+enum class E05 : I05 {
+    E;
+
+    fun test() = entries
+}
+
+@OptIn(ExperimentalStdlibApi::class)
+fun box(): String {
+    assertEquals(EBasic.entries.first().toString(), "A0") // make sure the feature is working
+
+    assertEquals(E0.entries, "OK")
+    assertEquals(Shadowing.E0.E.test(), "OK")
+    assertEquals(E01.entries.toString(), "OK")
+    assertEquals(E02.E.test(), "OK")
+
+    E03.E // to initialize e03Res
+    assertEquals(e03Res, "OK")
+
+    assertEquals(E04.E.entries, "OK")
+    assertEquals(E04.E.test(), "OK")
+    assertEquals(E05.E.test(), "OK")
+    return "OK"
+}