JS: create new common directory for all generated tests, migrate several tests there

js/js.translator/testData/box/inline/simpleEnum.kt

@@ -0,0 +1,26 @@
+/*
+ * Copy of JVM-backend test
+ * Found at: compiler/testData/codegen/boxInline/simple/simpleEnum.1.kt
+ */
+
+package foo
+
+enum class MyEnum {
+    K;
+
+    //TODO: KT-4693
+    inline fun <T> doSmth(a: T) : String {
+        return a.toString() + K.name
+    }
+}
+
+fun test1(): String {
+    return MyEnum.K.doSmth("O")
+}
+
+fun box(): String {
+    val result = test1()
+    if (result != "OK") return "fail1: ${result}"
+
+    return "OK"
+}