for #2299

rebase

Support MIPS32 24K family as P5600

Add half precision gemm for bfloat16 in OpenBLAS

Add a Windows/CL build job to the Azure CI

Revert "Add Windows build job on Azure CI"

This reverts commit e1e543b145.

* Add Windows-CL build job on Azure

and allow enforcing TARGET=1004K as well (omission from earlier 1004K merge and later introduction of TARGET check)

rebase

[OpenBLAS]: benchmark error of potrf

[description]: when the matrix size goes higher than 5800 during the cpotrf test, error info, such as "Potrf info = 5679", will be returned on ARM64 and x86 machines. Uplo = L & F.
[solution]: changed the func for building the matrix so that the complex Hermitian matrix can stay positive definite during the computation.
[dts]:

Update and reformat README

Add a drone.io multithread test for x86_64

This patch adds support for bfloat16 data type matrix multiplication kernel.
For architectures that don't support bfloat16, it is defined as unsigned short
(2 bytes).  Default unroll sizes can be changed as per architecture as done for
SGEMM and for now 8 and 4 are used for M and N.  Size of ncopy/tcopy can be
changed as per architecture requirement and for now, size 2 is used.

Added shgemm in kernel/power/KERNEL.POWER9 and tested in powerpc64le and
powerpc64.  For reference, added a small test compare_sgemm_shgemm.c to compare
sgemm and shgemm output.

This patch does not cover OpenBLAS test, benchmark and lapack tests for shgemm.
Complex type implementation can be discussed and added once this is approved.