add test files

js/js.translator/testFiles/rtti/cases/isSameClass.kt

@@ -0,0 +1,7 @@
+package foo
+
+class A() {
+
+}
+
+fun box() = (A() is A)

js/js.translator/testFiles/rtti/cases/notIsOtherClass.kt

@@ -0,0 +1,11 @@
+package foo
+
+open class A() {
+
+}
+
+class B() : A() {
+
+}
+
+fun box() = (A() !is B)