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Use of AOCL_ENABLE_INSTRUCTIONS in dgemm tiny code path is unnecessary and incorrectly caused AVX512 code to be run on zen4 and later processors when AOCL_ENABLE_INSTRUCTIONS=avx2 or equivalent options was selected. Replace with code to select kernel in a similar way to other dgemm code paths and other APIs. Note that at present AVX2 code is used the smallest matrix sizes on all zen platforms. AMD-Internal: [CPUPL-5078] Change-Id: Ie6b4895461cbbb915d2b48b92fc063f5cd6adb85