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x86 (32/64): go back to passing SIMD vectors by-ptr Fixes https://github.com/rust-lang/rust/issues/139029 by partially reverting https://github.com/rust-lang/rust/pull/135408 and going back to passing SIMD vectors by-ptr on x86. Sadly, by-val confuses the LLVM inliner so much that it's not worth it... Also fixes https://github.com/rust-lang/rust/issues/141848 by no longer actually using vector registers with the "Rust" ABI. r? `@tgross35` Cc `@nikic` try-job: `test-various*` try-job: dist-i586-gnu-i586-i686-musl try-job: x86_64-gnu-nopt try-job: `x86_64-msvc*` try-job: `i686-msvc*`