f16-f32acc-approxgelu for WebAssembly and native#10403
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```gemma4 12b on AMD Zen4 is 7.38% faster end to end Was scalar Inference (avg): 133760.34 ms (2 runs) 3.32% xnn_f16_vapproxgelu_ukernel__scalar_rational_6_4_div_u4 Now avx512skx Inference (avg): 124561.43 ms (2 runs) 0.03% xnn_f16_f32acc_vapproxgelu_ukernel__avx512f_rational_6_4_div_u32 ``` | Architecture | Status | Details | | :---------------- | :------- | :------------------------------------ | | WASM relaxed SIMD | Added | New native FP16 and f32acc kernels. | | x86 avx512fp16 | Added | New native FP16 microkernel (u32). | | x86 avx512f | Added | New microkernel using f16_f32acc. | | x86 f16c | Added | New microkernel using f16_f32acc. | | Hexagon hvx | Added | New f16_f32acc microkernel (u128). | | ARM neonfp16 | Added | New fallback using f16_f32acc. | | RISC-V rvvfp16 | Improved | Increased loop unroll u2v to u8v. | | Fallback scalar | Improved | Switched to f16_f32acc for precision. | PiperOrigin-RevId: 930857873
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f16-f32acc-approxgelu for WebAssembly and native