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

js/js.translator/testData/box/delegateProperty/capturedLocalVar.kt

@@ -0,0 +1,19 @@
+//TODO: reuse same tests from JVM backend
+package foo
+
+import kotlin.reflect.KProperty
+
+class Delegate {
+    var inner = 1
+    operator fun getValue(t: Any?, p: KProperty<*>): Int = inner
+    operator fun setValue(t: Any?, p: KProperty<*>, i: Int) {
+        inner = i
+    }
+}
+
+fun box(): String {
+    var prop: Int by Delegate()
+    run { prop = 2 }
+    if (prop != 2) return "fail get"
+    return run { if (prop != 2) "fail set" else "OK" }
+}