Get rid of last non-JSReceiver::Lookup usage of LookupOwn

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 4aeef9d4558b7a59c3dcb06aa3d2d8052d022b92..79c9d49a894b836b47997a5b1374e5a9ca003af6 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -4870,18 +4870,18 @@ RUNTIME_FUNCTION(Runtime_KeyedGetProperty) {
         }
         // Lookup cache miss.  Perform lookup and update the cache if
         // appropriate.
-        LookupResult result(isolate);
-        receiver->LookupOwn(key, &result);
-        if (result.IsField()) {
-          FieldIndex field_index = result.GetFieldIndex();
+        LookupIterator it(receiver, key, LookupIterator::CHECK_OWN);
+        if (it.IsFound() && it.state() == LookupIterator::PROPERTY &&
+            it.HasProperty() && it.property_details().type() == FIELD) {
+          FieldIndex field_index = it.GetFieldIndex();
           // Do not track double fields in the keyed lookup cache. Reading
           // double values requires boxing.
-          if (!result.representation().IsDouble()) {
+          if (!it.representation().IsDouble()) {
             keyed_lookup_cache->Update(receiver_map, key,
                 field_index.GetKeyedLookupCacheIndex());
           }
           AllowHeapAllocation allow_allocation;
-          return *JSObject::FastPropertyAt(receiver, result.representation(),
+          return *JSObject::FastPropertyAt(receiver, it.representation(),
                                            field_index);
         }
       } else {