Introduce IsUndefined(Isolate*) and IsTheHole(Isolate*)

src/string-stream.cc

Index: src/string-stream.cc
diff --git a/src/string-stream.cc b/src/string-stream.cc
index 3a8ac34b3850d3c46fa292a3ac4158fc379a95be..18a38be0aab3458ee7cdd6258259ffba19f32798 100644
--- a/src/string-stream.cc
+++ b/src/string-stream.cc
@@ -378,14 +378,14 @@ void StringStream::PrintUsingMap(JSObject* js_object) {
 
 
 void StringStream::PrintFixedArray(FixedArray* array, unsigned int limit) {
-  Heap* heap = array->GetHeap();
+  Isolate* isolate = array->GetIsolate();
   for (unsigned int i = 0; i < 10 && i < limit; i++) {
     Object* element = array->get(i);
-    if (element != heap->the_hole_value()) {
-      for (int len = 1; len < 18; len++)
-        Put(' ');
-      Add("%d: %o\n", i, array->get(i));
+    if (element->IsTheHole(isolate)) continue;
+    for (int len = 1; len < 18; len++) {
+      Put(' ');
     }
+    Add("%d: %o\n", i, array->get(i));
   }
   if (limit >= 10) {
     Add("                  ...\n");
@@ -527,7 +527,8 @@ void StringStream::PrintPrototype(JSFunction* fun, Object* receiver) {
   Object* name = fun->shared()->name();
   bool print_name = false;
   Isolate* isolate = fun->GetIsolate();
-  if (receiver->IsNull() || receiver->IsUndefined() || receiver->IsJSProxy()) {
+  if (receiver->IsNull() || receiver->IsUndefined(isolate) ||
+      receiver->IsJSProxy()) {
     print_name = true;
   } else if (isolate->context() != nullptr) {
     if (!receiver->IsJSObject()) {
@@ -539,7 +540,7 @@ void StringStream::PrintPrototype(JSFunction* fun, Object* receiver) {
          !iter.IsAtEnd(); iter.Advance()) {
       if (iter.GetCurrent()->IsJSProxy()) break;
       Object* key = iter.GetCurrent<JSObject>()->SlowReverseLookup(fun);
-      if (!key->IsUndefined()) {
+      if (!key->IsUndefined(isolate)) {
         if (!name->IsString() ||
             !key->IsString() ||
             !String::cast(name)->Equals(String::cast(key))) {