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x86: use SSE2 to pass float and SIMD types This builds on the new X86Sse2 ABI landed in https://github.com/rust-lang/rust/pull/137037 to actually make it a separate ABI from the default x86 ABI, and use SSE2 registers. Specifically, we use it in two ways: to return `f64` values in a register rather than by-ptr, and to pass vectors of size up to 128bit in a register (or, well, whatever LLVM does when passing `<4 x float>` by-val, I don't actually know if this ends up in a register). Cc `@workingjubilee` Fixes #133611 try-job: aarch64-apple try-job: aarch64-gnu try-job: aarch64-gnu-debug try-job: test-various try-job: x86_64-gnu-nopt try-job: dist-i586-gnu-i586-i686-musl try-job: x86_64-msvc-1