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

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

@@ -0,0 +1,21 @@
+package foo
+
+class A
+
+inline fun compare1(a: A): Boolean {
+    return a === a
+}
+
+inline fun compare2(a1: A, a2: A): Boolean {
+    return a1 === a2
+}
+
+fun box(): String {
+    assertEquals(true, compare1(A()), "compare1(A())")
+    assertEquals(false, compare2(A(), A()), "compare2(A(), A())")
+
+    val a = A()
+    assertEquals(true, compare2(a, a), "compare2(a, a)")
+
+    return "OK"
+}