Enable preaging of code objects when --optimize-for-size.

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 4132d2d4cf1d018bad1fbbffb00e5625bcc92bfb..aa65adcd87af1576567155834e0827605c4deee0 100644
--- a/test/cctest/test-serialize.cc
+++ b/test/cctest/test-serialize.cc
@@ -131,7 +131,7 @@ TEST(ExternalReferenceEncoder) {
   CHECK_EQ(make_code(UNCLASSIFIED, 3),
            encoder.Encode(
                ExternalReference::roots_array_start(isolate).address()));
-  CHECK_EQ(make_code(UNCLASSIFIED, 52),
+  CHECK_EQ(make_code(UNCLASSIFIED, 53),
            encoder.Encode(ExternalReference::cpu_features().address()));
 }