KT-53154 extract implementation of enumEntries into an expect/actual internal helper function

It's required, so it can be implemented in different backends
at a different pace and in a different manner

kotlin-native/runtime/src/main/kotlin/kotlin/enums/EnumEntriesNative.kt

@@ -0,0 +1,17 @@
+/*
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.enums
+
+@SinceKotlin("1.9")
+@ExperimentalStdlibApi
+@PublishedApi
+internal actual inline fun <reified T : Enum<T>> enumEntriesIntrinsic(): EnumEntries<T> {
+    /*
+     * Implementation note: this body will be replaced with `throw NotImplementedException()` the moment
+     * all backends starts intrinsifying this call.
+     */
+    return enumEntries(enumValues<T>())
+}

libraries/stdlib/js/src/kotlin/enums/EnumEntriesJs.kt

@@ -0,0 +1,17 @@
+/*
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.enums
+
+@SinceKotlin("1.9")
+@ExperimentalStdlibApi
+@PublishedApi
+internal actual inline fun <reified T : Enum<T>> enumEntriesIntrinsic(): EnumEntries<T> {
+    /*
+     * Implementation note: this body will be replaced with `throw NotImplementedException()` the moment
+     * all backends starts intrinsifying this call.
+     */
+    return enumEntries(enumValues<T>())
+}

libraries/stdlib/jvm-minimal-for-test/build.gradle.kts

@@ -39,7 +39,8 @@ val copySources by task<Sync> {
                  "kotlin/text/TypeAliases.kt")
     from(stdlibProjectDir.resolve("src"))
         .include("kotlin/collections/TypeAliases.kt",
-                 "kotlin/enums/EnumEntriesSerializationProxy.kt")
+                 "kotlin/enums/EnumEntriesSerializationProxy.kt",
+                 "kotlin/enums/EnumEntriesJVM.kt")
     from(stdlibProjectDir.resolve("../src"))
         .include("kotlin/util/Standard.kt",
                  "kotlin/internal/Annotations.kt",
@@ -52,8 +53,13 @@ val copySources by task<Sync> {
     into(File(buildDir, "src"))
 }
 
-tasks.withType<KotlinCompile> {
+
+
+tasks.compileKotlin {
     dependsOn(copySources)
+    val commonSources = listOf(
+        "kotlin/enums/EnumEntries.kt"
+    ).map { copySources.get().destinationDir.resolve(it) }
     kotlinOptions {
         freeCompilerArgs += listOf(
             "-Xallow-kotlin-package",
@@ -63,6 +69,11 @@ tasks.withType<KotlinCompile> {
         )
         moduleName = "kotlin-stdlib"
     }
+    doFirst {
+        kotlinOptions.freeCompilerArgs += listOf(
+            "-Xcommon-sources=${commonSources.joinToString(File.pathSeparator)}",
+        )
+    }
 }
 
 val jar = runtimeJar {

libraries/stdlib/jvm/src/kotlin/enums/EnumEntriesJVM.kt

@@ -0,0 +1,17 @@
+/*
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.enums
+
+@SinceKotlin("1.9")
+@ExperimentalStdlibApi
+@PublishedApi
+internal actual inline fun <reified T : Enum<T>> enumEntriesIntrinsic(): EnumEntries<T> {
+    /*
+     * Implementation note: this body will be replaced with `throw NotImplementedException()` the moment
+     * all backends starts intrinsifying this call.
+     */
+    return enumEntries(enumValues<T>())
+}

libraries/stdlib/src/kotlin/enums/EnumEntries.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -29,14 +29,12 @@ public sealed interface EnumEntries<E : Enum<E>> : List<E>
 @PublishedApi
 @ExperimentalStdlibApi
 @SinceKotlin("1.9")
-internal inline fun <reified T : Enum<T>> enumEntries(): EnumEntries<T> {
-    /*
-     * Implementation note: this body will be replaced with `throw NotImplementedException()` the moment
-     * all backends starts intrinsifying this call.
-     * Then this method will also be promoted to public.
-     */
-    return enumEntries(enumValues<T>())
-}
+internal inline fun <reified T : Enum<T>> enumEntries(): EnumEntries<T> = enumEntriesIntrinsic()
+
+@PublishedApi
+@ExperimentalStdlibApi
+@SinceKotlin("1.9")
+internal expect inline fun <reified T : Enum<T>> enumEntriesIntrinsic(): EnumEntries<T>
 
 @PublishedApi
 @SinceKotlin("1.8") // Used by pre-1.9.0 JVM compiler for the feature in preview mode. Can be safely removed around 2.1

libraries/stdlib/wasm/src/kotlin/enums/EnumEntriesWasm.kt

@@ -0,0 +1,17 @@
+/*
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.enums
+
+@SinceKotlin("1.9")
+@ExperimentalStdlibApi
+@PublishedApi
+internal actual inline fun <reified T : Enum<T>> enumEntriesIntrinsic(): EnumEntries<T> {
+    /*
+     * Implementation note: this body will be replaced with `throw NotImplementedException()` the moment
+     * all backends starts intrinsifying this call.
+     */
+    return enumEntries(enumValues<T>())
+}