Revert "Use WeakCells in the optimized code map rather than traversing in pause."

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 103697239bbb2916f0ba1cb4ddb88da74e136a14..923f434ed019969a61ba765537be4fa72b0819e9 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -2780,14 +2780,8 @@ void Heap::CreateInitialObjects() {
   }
 
   {
-    Handle<WeakCell> cell = factory->NewWeakCell(factory->undefined_value());
-    set_empty_weak_cell(*cell);
-    cell->clear();
-
     Handle<FixedArray> cleared_optimized_code_map =
         factory->NewFixedArray(SharedFunctionInfo::kEntriesStart, TENURED);
-    cleared_optimized_code_map->set(SharedFunctionInfo::kSharedCodeIndex,
-                                    *cell);
     STATIC_ASSERT(SharedFunctionInfo::kEntriesStart == 1 &&
                   SharedFunctionInfo::kSharedCodeIndex == 0);
     set_cleared_optimized_code_map(*cleared_optimized_code_map);