auto merge of #5058 : Thiez/rust/incoming, r=catamorphism

I've moved all intrinsics in a single file (libcore/private/intrinsics.rs) and changed a few files to make use of this file (e.g. vec.rs: move_val_init).

Two intrinsics have been commented out:
visit_tydesc: it uses TyDesc and TyVisitor, this would create a dependency on librustc which seems undesirable.
frame_address: I really had no idea what it should look like without the legacy modes (would it even work? In several places in libcore the (legacy-modes) intrinsics were wrapped
with a normal fn) and what it was supposed to do.

Some documentation is still required, but many names are fairly self-explanatory.

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