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Add AOCL_ENABLE_INSTRUCTIONS environment variable as an alternative to BLIS_ARCH_TYPE. The details are: 1. AOCL_ENABLE_INSTRUCTIONS and BLIS_ARCH_TYPE env vars are both supported, with BLIS_ARCH_TYPE taking precedence if both are set. 2. Values of "avx2" and "avx512" are aliases for "zen3" and "zen4" code paths respectively in AMD focused builds, or for "skx" and "haswell" respectively in Intel focused builds. These names are not case-sensitive. 3. BLIS_ARCH_TYPE specifies the code path to use. If this is unsupported, e.g. zen4 code path on a Milan or earlier system, that code path is still executed, likely resulting in an illegal instruction error. 4. By contrast, AOCL_ENABLE_INSTRUCTIONS will check ISA support on the system (for AVX2 and AVX512), and try a "lower" ISA option if the desired one is not supported, i.e. AVX512->AVX2, AVX2->generic. 5. Appropriate messages are printed if BLIS_ARCH_DEBUG=1 is set. AMD-Internal: [CPUPL-4105] Change-Id: Ia941b41d4b7d11f5589d7c5e16f607618baed315