snapshot-weakcells.diff

diff --git a/src/profiler/heap-snapshot-generator.cc b/src/profiler/heap-snapshot-generator.cc
index c80877f623..fad693d3be 100644
--- a/src/profiler/heap-snapshot-generator.cc
+++ b/src/profiler/heap-snapshot-generator.cc
@@ -953,6 +953,7 @@ const char* V8HeapExplorer::GetSystemEntryName(HeapObject* object) {
     case NAME##_TYPE: return "system / "#Name;
   STRUCT_LIST(MAKE_STRUCT_CASE)
 #undef MAKE_STRUCT_CASE
+    case WEAK_CELL_TYPE: return "system / WeakCell";
     default: return "system";
   }
 }