The length of the platform-intrinsic function `simd_shuffle`
wasn't specified. Erroneous code example:
```compile_fail,E0439
#![feature(platform_intrinsics)]
extern "platform-intrinsic" {
fn simd_shuffle<A,B>(a: A, b: A, c: [u32; 8]) -> B;
// error: invalid `simd_shuffle`, needs length: `simd_shuffle`
}
```
The `simd_shuffle` function needs the length of the array passed as
last parameter in its name. Example:
```
#![feature(platform_intrinsics)]
extern "platform-intrinsic" {
fn simd_shuffle8<A,B>(a: A, b: A, c: [u32; 8]) -> B;
}
```