Remove useless heap allocation in Value::dump.
Remove useless heap allocation in Value::dump.

root-mirror/cling,karies/cling,karies/cling,root-mirror/cling,root-mirror/cling,marsupial/cling,marsupial/cling,marsupial/cling,karies/cling,root-mirror/cling,marsupial/cling,karies/cling,root-mirror/cling,root-mirror/cling,marsupial/cling,karies/cling,karies/cling,marsupial/cling