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remove `simd_fpow` and `simd_fpowi` Discussed in https://github.com/rust-lang/rust/issues/137555 These functions are not exposed from `std::intrinsics::simd`, and not used anywhere outside of the compiler. They also don't lower to particularly good code at least on the major ISAs (I checked x86_64, aarch64, s390x, powerpc), where the vector is just spilled to the stack and scalar functions are used for the actual logic. r? `@RalfJung`