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Rollup merge of #125311 - calebzulawski:repr-packed-simd-intrinsics, r=workingjubilee
Make repr(packed) vectors work with SIMD intrinsics
In #117116 I fixed `#[repr(packed, simd)]` by doing the expected thing and removing padding from the layout. This should be the last step in providing a solution to rust-lang/portable-simd#319
