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1e9c39a3f9
To improve hygiene, consistency, and usability, it would be good to replace all the macro intrinsics in wasm_simd128.h with functions. The reason for using macros in the first place was to enforce the use of constants for some arguments using `_Static_assert` with `__builtin_constant_p`. This commit switches to using functions and uses the `__diagnose_if__` attribute rather than `_Static_assert` to enforce constantness. The remaining macro intrinsics cannot be made into functions until the builtin functions they are implemented with can be replaced with normal code patterns because the builtin functions themselves require that their arguments are constants. This commit also fixes a bug with the const_splat intrinsics in which the f32x4 and f64x2 variants were incorrectly producing integer vectors. Differential Revision: https://reviews.llvm.org/D102018
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