remove some SSE/SSE2 intrinsics that are no longer used by stdarch

[RalfJung]

Fixes #3691

[RalfJung]

Blocked on rust-lang/stdarch#1584 propagating to the rustc repo.

[TDecking]

The stdarch patch will also ensure that the "sqrt.ps.256" case in https://github.com/rust-lang/miri/blob/master/src/shims/x86/avx.rs#L78 will never be reached. This case is still present here.

[RalfJung]

Yeah, but sqrt is implemented together with two other functions there so there's not really any code saved by removing that... 🤷

The same goes for sse.sqrt.ss, sse.sqrt.ps.

[RalfJung]

Hm I guess this removes all uses of FloatUnaryOp::Sqrt. So maybe it's worth it after all.

[TDecking]

@RalfJung rust-lang/rust#128466 got merged. This PR is no longer blocked.

[RalfJung]

Ah, good point, thanks! :)

@bors r+

[bors]

📌 Commit 8bf6dae has been approved by RalfJung

It is now in the queue for this repository.

[bors]

⌛ Testing commit 8bf6dae with merge 0537b14...

[bors]

💔 Test failed - checks-actions

[RalfJung]

Ah, maybe we need the rustup to land first.

[RalfJung]

Hm, no... we had a rustup yesterday, so rust-lang/rust#128466 should have been picked up.

[RalfJung]

D'oh, this is from a Miri test directly importing the intrinsic.^^

[RalfJung]

@bors r+

[bors]

📌 Commit 3e79bb4 has been approved by RalfJung

It is now in the queue for this repository.

[bors]

⌛ Testing commit 3e79bb4 with merge 2ae377f...

[bors]

☀️ Test successful - checks-actions
Approved by: RalfJung
Pushing 2ae377f to master...