Unrecognized platform-specific intrinsic function

Since upgrading to 1.33.0-nightly (bf669d1e3 2019-01-25), when compiling the x86intrin crate:

https://crates.io/crates/x86intrin

I ran into the following errors:

error: unrecognized platform-specific intrinsic function: `x86_mm_max_ps`

fn x86_mm_max_ps(a: m128, b: m128) -> m128;

It compiled fine on 1.32.0-nightly.

They were an unstable nightly-only API that has now been removed. Use std::arch instead.