ppc: blend pwr9 implementation
blend_w4_8bpc_pwr9: 14.4 ( 1.90x)
blend_w8_8bpc_pwr9: 19.9 ( 3.62x)
blend_w16_8bpc_pwr9: 50.6 ( 5.17x)
blend_w32_8bpc_pwr9: 125.8 ( 5.33x)
blend_w4_8bpc_pwr9: 14.4 ( 1.90x)
blend_w8_8bpc_pwr9: 19.9 ( 3.62x)
blend_w16_8bpc_pwr9: 50.6 ( 5.17x)
blend_w32_8bpc_pwr9: 125.8 ( 5.33x)
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