[runtime] Use PropertyKind/PropertyLocation instead of PropertyType.

src/string-stream.cc

Index: src/string-stream.cc
diff --git a/src/string-stream.cc b/src/string-stream.cc
index 04f8c271fd515dd834b337138b23f82e32bf0549..650b3cf93a2f300df41b7209db5243516d84d4c7 100644
--- a/src/string-stream.cc
+++ b/src/string-stream.cc
@@ -304,7 +304,8 @@ void StringStream::PrintUsingMap(JSObject* js_object) {
   DescriptorArray* descs = map->instance_descriptors();
   for (int i = 0; i < real_size; i++) {
     PropertyDetails details = descs->GetDetails(i);
-    if (details.type() == DATA) {
+    if (details.location() == kField) {
+      DCHECK_EQ(kData, details.kind());
       Object* key = descs->GetKey(i);
       if (key->IsString() || key->IsNumber()) {
         int len = 3;