KJS: allow to use KClass::isInstance; implement isInstance in KClassImpl

js/js.translator/testData/box/reflection/kClassIsInstance.kt

@@ -0,0 +1,22 @@
+package foo
+
+import kotlin.reflect.KClass
+
+fun <A : Any, B : A> check(k: KClass<A>, instance: B, nonInstance: Any) {
+    assertTrue(k.isInstance(instance))
+    assertFalse(k.isInstance(nonInstance))
+    assertFalse(k.isInstance(null))
+}
+
+fun box(): String {
+    check(A::class, A(), O)
+    check(A::class, B(), O)
+    check(O::class, O, object {})
+    check(I::class, object : I {}, object {})
+    check(E::class, E.X, A())
+    check(E::class, E.Y, B())
+    check(E::class, E.Z, O)
+    check(E.Y::class, E.Y, E.X)
+
+    return "OK"
+}