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feat(metal,composite,passes): add MSL sub-byte quantization, SwiGLU c… - #111

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…omposite ops, and LayerNorm+GELU fusion pass

  • Implement fused 4-bit integer quantization and dequantization MSL custom kernels
  • Implement SwiGLU and SwiGLUImpl composite ops with direct Core AI IR lowering
  • Register native lowerings for glu, softplus, mish, and elu in _aten_to_core
  • Add LayerNorm + GELU graph fusion pass with fused two-pass reduction MSL kernel
  • Add comprehensive test suites for quantization, SwiGLU, lowering, and fusion pass

…omposite ops, and LayerNorm+GELU fusion pass

- Implement fused 4-bit integer quantization and dequantization MSL custom kernels
- Implement SwiGLU and SwiGLUImpl composite ops with direct Core AI IR lowering
- Register native lowerings for glu, softplus, mish, and elu in _aten_to_core
- Add LayerNorm + GELU graph fusion pass with fused two-pass reduction MSL kernel
- Add comprehensive test suites for quantization, SwiGLU, lowering, and fusion pass
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