Improve the performance of rot by using AVX512 and AVX2 intrinsic

Fix missing AVX2 and FMA3 capabilities in FORCE_target mode

Optimize sdot/ddot for POWER10

Fix handling of cpu capability flags in DYNAMIC_ARCH builds

This patch makes use of new POWER10 vector pair instructions for
loads and stores.

rebase

Fix macro name used in ifdef for POWERPC/PGI

Ensure that EXPRECISION is disabled for DYNAMIC_ARCH with TARGET=GENERIC and fix CMAKE DYNAMIC_ARCH builds

POWER10:  Change dgemm unroll factors

NO_EXPRECISION is disabled for the GENERIC_TARGET already, so prevent mixing with code parts that use a different float size by default

add openbsd 68+ gfortran name

Reunify default BUFFER_SIZE on ARM64 to avoid crashes in DYNAMIC_ARCH mode

Changing the unroll factors for dgemm to 8 shows improved performance with
POWER10 MMA feature.   Also made some minor changes in sgemm for edge cases.

rebase

fix avx2 detection

reword commits to make it clearer

Optimize caxpy for POWER10

This patch makes use of new POWER10 vector pair instructions for
loads and stores.

Refactor the performance measurement system

Implementation of BF16 based gemv

Fix cooperlake compile issue

Add a missing macro which is required in Makefile.x86_64 due to recent
clearnup, which causes cooperlake platform build failure.

1. Add a new API -- sbgemv to support bfloat16 based gemv
2. Implement a generic kernel for sbgemv
3. Implement an avx512-bf16 based kernel for sbgemv

Signed-off-by: Chen, Guobing <guobing.chen@intel.com>

reuse variables defined in Makefile.system

Minor Makefile cleanup

Try to read cpu ID from /sys/devices/.../cpu0 if HWCAP_CPUID fails