Bugfix: Make sure not to overwrite the empty optimized code map root.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 1fe8fb4ff05f475f8b183979d5be5b2b07bca6d8..5bcf877f0bf1cde8c691146684c075e8420e915c 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -12123,9 +12123,14 @@ void SharedFunctionInfo::AddSharedCodeToOptimizedCodeMap(
   if (isolate->serializer_enabled()) return;
   DCHECK(code->kind() == Code::OPTIMIZED_FUNCTION);
   // Empty code maps are unsupported.
-  if (shared->OptimizedCodeMapIsCleared()) return;
-  Handle<WeakCell> cell = isolate->factory()->NewWeakCell(code);
-  shared->optimized_code_map()->set(kSharedCodeIndex, *cell);
+  if (!shared->OptimizedCodeMapIsCleared()) {
+    Handle<WeakCell> cell = isolate->factory()->NewWeakCell(code);
+    // A collection may have occured and cleared the optimized code map in the
+    // allocation above.
+    if (!shared->OptimizedCodeMapIsCleared()) {
+      shared->optimized_code_map()->set(kSharedCodeIndex, *cell);
+    }
+  }
 }