Revert of Deactivate Parser Bookmarks

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index 1fb7adba67a6c079b5709732aa07e0ea0e84f229..319d468e4d61db43f529e8424139842d7bede8ba 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -4168,9 +4168,8 @@
     // try to lazy parse in the first place, we'll have to parse eagerly.
     Scanner::BookmarkScope bookmark(scanner());
     if (is_lazily_parsed) {
-      // Deactivate bookmarks for now because they result
-      // race conditions while parsing.
-      Scanner::BookmarkScope* maybe_bookmark = nullptr;
+      Scanner::BookmarkScope* maybe_bookmark =
+          bookmark.Set() ? &bookmark : nullptr;
       SkipLazyFunctionBody(&materialized_literal_count,
                            &expected_property_count, /*CHECK_OK*/ ok,
                            maybe_bookmark);