Rewrite fmt() and to_option() in terms of raw_ptr().
Rewrite fmt() and to_option() in terms of raw_ptr().

bnoordhuis/v8.rs,tempbottle/v8.rs,bnoordhuis/v8.rs,bnoordhuis/v8.rs,tempbottle/v8.rs,tempbottle/v8.rs,tempbottle/v8.rs,tempbottle/v8.rs,tempbottle/v8.rs,bnoordhuis/v8.rs,Qard/v8.rs,bnoordhuis/v8.rs,bnoordhuis/v8.rs