[FIR] Try to load properties in order according to kotlinx.serialization metadata extension

Move metadata extension with property order from kotlinx.serialization to core

After fix of KT-54792 properties will be deserialized in declaration order
  if corresponding class was compiled with modern compiler. But this order
  is needed for kotlinx.serialization for binaries compiled with any
  kotlin compiler >= 1.4. Since we don't plan to add any extension points
  into (de)serialization into FIR, we need to take into account existing
  metadata extension from kotlinx.serialization in compiler itself

^KT-57769 Fixed

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/K2KotlinxSerializationIT.kt

@@ -10,7 +10,7 @@ import org.jetbrains.kotlin.gradle.testbase.*
 import org.junit.jupiter.api.DisplayName
 
 @OtherGradlePluginTests
-class KotlinxSerializationMppK2IT : KGPBaseTest() {
+class K2KotlinxSerializationIT : KGPBaseTest() {
     private val gradleVersion = GradleVersion.version(TestVersions.Gradle.MAX_SUPPORTED)
 
     @DisplayName("Compile common code to metadata with kotlinx.serialization and K2")
@@ -19,7 +19,16 @@ class KotlinxSerializationMppK2IT : KGPBaseTest() {
         project("kotlinxSerializationMppK2", gradleVersion) {
             build(":compileCommonMainKotlinMetadata") {
                 assertTasksExecuted(":compileCommonMainKotlinMetadata")
-                assertOutputContains("BUILD SUCCESSFUL")
+            }
+        }
+    }
+
+    @DisplayName("Compile code with kotlinx.serialization with K2 against K1")
+    @GradleTest
+    fun `test kotlinx serialization K2 against K1`() {
+        project("kotlinxSerializationK2AgainstK1", gradleVersion) {
+            build(":app:run") {
+                assertTasksExecuted(":app:run")
             }
         }
     }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kotlinxSerializationK2AgainstK1/app/build.gradle.kts

@@ -0,0 +1,20 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+import org.jetbrains.kotlin.gradle.dsl.KotlinVersion
+
+plugins {
+    application
+}
+
+dependencies {
+    implementation(project(":lib"))
+}
+
+val compileKotlin: KotlinCompile by tasks
+
+compileKotlin.compilerOptions {
+    languageVersion.set(KotlinVersion.KOTLIN_2_0)
+}
+
+application {
+    mainClass.set("foo.MainKt")
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kotlinxSerializationK2AgainstK1/app/src/main/kotlin/Main.kt

@@ -0,0 +1,32 @@
+/*
+ * 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 foo
+
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.Serializable
+
+@Serializable
+class Derived(val d: Long = 1000000000000) : Base(2, "world", listOf("b", "c")) {
+    override fun equals(other: Any?): Boolean {
+        if (other !is Derived) return false
+        return a == other.a && b == other.b && c == other.c && d == other.d
+    }
+
+    override fun toString(): String {
+        return "a: $a, b: $b, c: $c, d: $d"
+    }
+}
+
+fun main() {
+    val expected = Derived(12)
+    val result = Json.encodeToString(Derived.serializer(), expected)
+    if (result != """{"c":2,"b":"world","a":["b","c"],"d":12}""") {
+        throw IllegalStateException("Error: $result")
+    }
+    val actual = Json.decodeFromString(Derived.serializer(), result)
+    if (expected != actual) {
+        throw IllegalStateException("expected: $expected\nactual: $actual")
+    }
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kotlinxSerializationK2AgainstK1/build.gradle.kts

@@ -0,0 +1,27 @@
+plugins {
+    kotlin("jvm") apply false
+    kotlin("plugin.serialization") apply false
+    java
+}
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+}
+
+subprojects {
+    apply {
+        plugin("java")
+        plugin("kotlin")
+        plugin("org.jetbrains.kotlin.plugin.serialization")
+    }
+
+    repositories {
+        mavenLocal()
+        mavenCentral()
+    }
+
+    dependencies {
+        implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.5.0")
+    }
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kotlinxSerializationK2AgainstK1/lib/build.gradle.kts

@@ -0,0 +1,8 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+import org.jetbrains.kotlin.gradle.dsl.KotlinVersion
+
+val compileKotlin: KotlinCompile by tasks
+
+compileKotlin.compilerOptions {
+    languageVersion.set(KotlinVersion.KOTLIN_1_9)
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kotlinxSerializationK2AgainstK1/lib/src/main/kotlin/Base.kt

@@ -0,0 +1,14 @@
+/*
+ * 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 foo
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+open class Base(
+    val c: Int = 1,
+    val b: String = "hello",
+    val a: List<String> = listOf("a")
+)

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kotlinxSerializationK2AgainstK1/settings.gradle.kts

@@ -0,0 +1,3 @@
+rootProject.name = "kotlinxSerializationK2AgainstK1"
+
+include(":lib", "app")