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Feature Addition : Added low precision GEMM to addon. The kernel takes unsigned int8 and signed int8 as inputs and performs GEMM operation. The intermediate accumulation and output are in signed int16. - The compute kernel will perform computation only if B matrix reordered to suit the usage of AVX2 instruction vpmaddubsw. - Kernel for packing the B matrix is provided. - LPGEMM bench code was modified to test the performance and accuracy of the new variant. AMD-Internal: [CPUPL-2171] Change-Id: Id9a6d90b79f4bf82fb2e2f3093974dbf37275f9b