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

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

@@ -0,0 +1,25 @@
+package foo
+
+inline fun run(func: () -> Int): Int {
+    return func()
+}
+
+fun bar(): Int {
+    var f = { -> 0 }
+    var get0 = f
+
+    f = { -> 1 }
+    var get1 = f
+
+    var get2 = get1
+    f = { -> 2 }
+    get2 = f
+
+    return run(get0) + run(get1) + run(get2)
+}
+
+fun box(): String {
+    assertEquals(3, bar())
+
+    return "OK"
+}