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import `simd_` intrinsics In most cases, we can import the simd intrinsics rather than redeclare them. Apparently, most of these tests were written before `std::intrinsics::simd` existed. There are a couple of exceptions where we can't yet import: - the intrinsics are not declared as `const fn` in the standard library, causing issues in the `const-eval` tests - the `simd_shuffle_generic` function is not exposed from `std::intrinsics` - the `simd_fpow` and `simd_fpowi` functions are not exposed from `std::intrinsics` (removed in https://github.com/rust-lang/rust/pull/137595) - some tests use `no_core`, and therefore cannot use `std::intrinsics` r? ```@RalfJung``` cc ```@workingjubilee``` do you have context on why some intrinsics are not exposed?