Inobject slack tracking is done on a per-closure basis instead of per-shared info basis.

src/heap-snapshot-generator.cc

Index: src/heap-snapshot-generator.cc
diff --git a/src/heap-snapshot-generator.cc b/src/heap-snapshot-generator.cc
index cafee77b4ce10d20be74ee3df7fe290349cff63f..b8ee080d86f44ebabdcb4252740d5d932e4abe03 100644
--- a/src/heap-snapshot-generator.cc
+++ b/src/heap-snapshot-generator.cc
@@ -1409,9 +1409,6 @@ void V8HeapExplorer::ExtractSharedFunctionInfoReferences(
   SetInternalReference(obj, entry,
                        "feedback_vector", shared->feedback_vector(),
                        SharedFunctionInfo::kFeedbackVectorOffset);
-  SetWeakReference(obj, entry,
-                   "initial_map", shared->initial_map(),
-                   SharedFunctionInfo::kInitialMapOffset);
 }