miri: implement some `llvm.x86.sse.*` intrinsics and add tests PR moved from https://github.com/rust-lang/rust/pull/113932. Implements LLVM intrisics needed to run most SSE functions from `core::arch::x86{,_64}`. Also adds miri tests for those functions (mostly copied from core_arch tests). r? `@RalfJung` The first commit is the same that the commit in the PR I had opened in the Rust repository. I addressed review comments in additional commits to make it easier to review. I also fixed formatting and clippy warnings.