[JS IR] Support IR dump in JS tests

compiler/tests-common/tests/org/jetbrains/kotlin/test/DebugMode.kt

@@ -0,0 +1,30 @@
+/*
+ * 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
+
+/**
+ * Represents a mode fore debugging tests. Depending on what is tested, can represent different things.
+ * For example, in JS IR and WASM tests the selected mode will determine if the test output should include IR dumps.
+ */
+enum class DebugMode {
+    NONE,
+    DEBUG,
+    SUPER_DEBUG;
+
+    companion object {
+
+        /**
+         * Obtains a [DebugMode] from the system property with the given [key].
+         * If the property is not defined, returns [NONE].
+         */
+        fun fromSystemProperty(key: String): DebugMode = when (System.getProperty(key)) {
+            "2", "super_debug" -> SUPER_DEBUG
+            "1", "true", "debug" -> DEBUG
+            "0", "false", "", null -> NONE
+            else -> NONE
+        }
+    }
+}