Revert of [regexp] Remove IsRegExp intrinsic

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

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/interpreter/interpreter-intrinsics.h"
 #include "test/cctest/interpreter/interpreter-tester.h"
 
 namespace v8 {
@@ skipping 96 matching lines @@
   CHECK_EQ(*factory->false_value(), *helper.Invoke(helper.NewObject("(/x/)")));
   CHECK_EQ(*factory->false_value(), *helper.Invoke(helper.Undefined()));
   CHECK_EQ(*factory->false_value(), *helper.Invoke(helper.Null()));
   CHECK_EQ(*factory->false_value(),
            *helper.Invoke(helper.NewObject("'string'")));
   CHECK_EQ(*factory->false_value(), *helper.Invoke(helper.NewObject("42")));
   CHECK_EQ(*factory->true_value(),
            *helper.Invoke(helper.NewObject("new Proxy({},{})")));
 }
 
+TEST(IsRegExp) {
+  HandleAndZoneScope handles;
+
+  InvokeIntrinsicHelper helper(handles.main_isolate(), handles.main_zone(),
+                               Runtime::kInlineIsRegExp);
+  Factory* factory = handles.main_isolate()->factory();
+
+  CHECK_EQ(*factory->false_value(),
+           *helper.Invoke(helper.NewObject("new Date()")));
+  CHECK_EQ(*factory->false_value(),
+           *helper.Invoke(helper.NewObject("(function() {})")));
+  CHECK_EQ(*factory->false_value(), *helper.Invoke(helper.NewObject("([1])")));
+  CHECK_EQ(*factory->false_value(), *helper.Invoke(helper.NewObject("({})")));
+  CHECK_EQ(*factory->true_value(), *helper.Invoke(helper.NewObject("(/x/)")));
+  CHECK_EQ(*factory->false_value(), *helper.Invoke(helper.Undefined()));
+  CHECK_EQ(*factory->false_value(), *helper.Invoke(helper.Null()));
+  CHECK_EQ(*factory->false_value(),
+           *helper.Invoke(helper.NewObject("'string'")));
+  CHECK_EQ(*factory->false_value(), *helper.Invoke(helper.NewObject("42")));
+}
+
 TEST(IsTypedArray) {
   HandleAndZoneScope handles;
 
   InvokeIntrinsicHelper helper(handles.main_isolate(), handles.main_zone(),
                                Runtime::kInlineIsTypedArray);
   Factory* factory = handles.main_isolate()->factory();
 
   CHECK_EQ(*factory->false_value(),
            *helper.Invoke(helper.NewObject("new Date()")));
   CHECK_EQ(*factory->false_value(),
@@ skipping 136 matching lines @@
             ->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