Auto merge of #1366 - gnzlbg:vec, r=emiliov0.38.0

Map vector types to arrays and pass them by value

This PR maps vector types to arrays and passes them by value (that is, they are passed to C as `[T; N]`.  This already allows defining them as a blacklisted opaque type, such that the user can provide its own definition from e.g. `std::arch`.

A subsequent PR should map vector types to unit structs with a private member:

```rust
#[repr(align(16))] pub struct __m128([f32; 4]);
```

to make their alignment at least be correct. This should allow transmuting `std::arch` types to these types properly.

Once that is done, we probably want to detect the canonical vector types (e.g. `__m128`) and pull in the type from `std`/`core`::arch instead.

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