Convert intrinsics away from argument modes

[bblum]

In middle/typeck/check.rs, middle/trans/foreign.rs, and middle/trans/type_use.rs, several of the intrinsics still use the old argument modes. These are:

reinterpret_cast -- ast::by_ref
addr_of -- ast::by_ref
move_val, move_val_init -- ast::by_mutbl_ref
atomic_* -- ast::by_mutbl_ref
visit_tydesc -- ast::by_ref
frame_address -- ast::by_ref

[luqmana]

I believe this can be closed now.