[Interpreter] Add ClassOf intrinsic.

test/cctest/interpreter/test-interpreter-intrinsics.cc

Index: test/cctest/interpreter/test-interpreter-intrinsics.cc
diff --git a/test/cctest/interpreter/test-interpreter-intrinsics.cc b/test/cctest/interpreter/test-interpreter-intrinsics.cc
index 7b3d0d16fec3125f111fc075361a639fbe21bfdf..7862461084ca8cafec9df87a1aac6b80ffdda550 100644
--- a/test/cctest/interpreter/test-interpreter-intrinsics.cc
+++ b/test/cctest/interpreter/test-interpreter-intrinsics.cc
@@ -267,6 +267,27 @@ TEST(ValueOf) {
             ->SameValue(*helper.NewObject("'foobar'")));
 }
 
+TEST(ClassOf) {
+  HandleAndZoneScope handles;
+  Isolate* isolate = handles.main_isolate();
+  Factory* factory = isolate->factory();
+  InvokeIntrinsicHelper helper(handles.main_isolate(), handles.main_zone(),
+                               Runtime::kInlineClassOf);
+  CHECK_EQ(*helper.Invoke(helper.NewObject("123")), *factory->null_value());
+  CHECK_EQ(*helper.Invoke(helper.NewObject("'true'")), *factory->null_value());
+  CHECK_EQ(*helper.Invoke(helper.NewObject("'foo'")), *factory->null_value());
+  CHECK(helper.Invoke(helper.NewObject("({a:1})"))
+            ->SameValue(*helper.NewObject("'Object'")));
+  CHECK(helper.Invoke(helper.NewObject("(function foo() {})"))
+            ->SameValue(*helper.NewObject("'Function'")));
+  CHECK(helper.Invoke(helper.NewObject("new Date()"))
+            ->SameValue(*helper.NewObject("'Date'")));
+  CHECK(helper.Invoke(helper.NewObject("new Set"))
+            ->SameValue(*helper.NewObject("'Set'")));
+  CHECK(helper.Invoke(helper.NewObject("/x/"))
+            ->SameValue(*helper.NewObject("'RegExp'")));
+}
+
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8