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Increasing the SIMD size improves the vectorization possibilities Change the `simd-wide-sum.rs` to pass tests based on the LLVM main branch. For smaller lengths, we cannot expect to always get vectorized. A related discussion at https://rust-lang.zulipchat.com/#narrow/stream/187780-t-compiler.2Fwg-llvm/topic/LLVM.20HEAD.3A.20codegen.2Fsimd.2Fsimd-wide-sum.2Ers.20newly.20failing. r? scottmcm