[Test] Add new directive for specifying target platform for module

compiler/test-infrastructure/tests/org/jetbrains/kotlin/test/directives/ModuleStructureDirectives.kt

@@ -52,4 +52,8 @@ object ModuleStructureDirectives : SimpleDirectivesContainer() {
             Declares backend for analyzing current module 
         """.trimIndent()
     )
+
+    val TARGET_PLATFORM by enumDirective<TargetPlatformEnum>(
+        "Declares target platform for current module"
+    )
 }

compiler/test-infrastructure/tests/org/jetbrains/kotlin/test/directives/TargetPlatformEnum.kt

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2010-2021 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 org.jetbrains.kotlin.test.directives
+
+import org.jetbrains.kotlin.config.JvmTarget
+import org.jetbrains.kotlin.platform.TargetPlatform
+import org.jetbrains.kotlin.platform.js.JsPlatforms
+import org.jetbrains.kotlin.platform.jvm.JdkPlatform
+import org.jetbrains.kotlin.platform.jvm.JvmPlatforms
+import org.jetbrains.kotlin.platform.konan.NativePlatformUnspecifiedTarget
+import org.jetbrains.kotlin.platform.konan.NativePlatforms
+
+enum class TargetPlatformEnum(val targetPlatform: TargetPlatform) {
+    Common(
+        TargetPlatform(
+            setOf(
+                JdkPlatform(JvmTarget.DEFAULT),
+                JsPlatforms.DefaultSimpleJsPlatform,
+                NativePlatformUnspecifiedTarget
+            )
+        )
+    ),
+
+    JVM(JvmPlatforms.unspecifiedJvmPlatform),
+    JVM_1_6(JvmPlatforms.jvm16),
+    JVM_1_8(JvmPlatforms.jvm18),
+
+    JS(JsPlatforms.defaultJsPlatform),
+    Native(NativePlatforms.unspecifiedNativePlatform)
+}