[heap] Minor MC: Add marking

test/cctest/test-serialize.cc

Index: test/cctest/test-serialize.cc
diff --git a/test/cctest/test-serialize.cc b/test/cctest/test-serialize.cc
index 1b5497f7720a69fdffac3c005c289fc4618c239f..792608f2e053a8fc139518c527718419b89ba4a3 100644
--- a/test/cctest/test-serialize.cc
+++ b/test/cctest/test-serialize.cc
@@ -1821,6 +1821,7 @@ TEST(CodeSerializerEagerCompilationAndPreAge) {
 }
 
 TEST(Regress503552) {
+  if (!FLAG_incremental_marking) return;
   // Test that the code serializer can deal with weak cells that form a linked
   // list during incremental marking.
   CcTest::InitializeVM();