Add script context with context-allocated "const this"

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 de5c24b5823a0b3f5c212a806aeb1dd5115f3ea5..89623305499907c64c14475000f309a5c0219098 100644
--- a/test/cctest/test-serialize.cc
+++ b/test/cctest/test-serialize.cc
@@ -493,7 +493,7 @@ UNINITIALIZED_DEPENDENT_TEST(ContextDeserialization, ContextSerialization) {
                                           &outdated_contexts).ToHandleChecked();
       CHECK(root->IsContext());
       CHECK(Handle<Context>::cast(root)->global_proxy() == *global_proxy);
-      CHECK_EQ(1, outdated_contexts->length());
+      CHECK_EQ(2, outdated_contexts->length());
     }
 
     Handle<Object> root2;