JS/RTTI: in expressions like a as T when inferred type for a is S, where S <: T, don't generate type checking

js/js.translator/testData/expression/cast/cases/noRuntimeTypeCheck.kt

@@ -0,0 +1,28 @@
+package foo
+
+// CHECK_METHOD_NOT_CALLED_IN_SCOPE: scope=box function=isType
+
+open class A()
+
+class B() : A()
+
+fun box(): String {
+    assertTrue(B() is A)
+    assertTrue(B() is A?)
+    assertTrue(B() is B)
+    assertTrue(B() is B?)
+    assertTrue((B() as B?) is A?)
+    assertTrue((null as A?) is A?)
+
+    assertNotEquals(null, B() as? A)
+    assertNotEquals(null, B() as? A?)
+    assertNotEquals(null, B() as? B)
+    assertNotEquals(null, B() as? B?)
+
+    assertNotEquals(null, B() as A)
+    assertNotEquals(null, B() as A?)
+    assertNotEquals(null, B() as B)
+    assertNotEquals(null, B() as B?)
+
+    return "OK"
+}