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.

Add a read memory barrier to the traversal of the buffer slot list

Handle unaligned data in the SSE2 copy kernel

should have no performance impact on reasonably modern cpus and fixes occasional crashes in actual user code.

Needed on systems with weak memory ordering - the inferior, partially working fix from #2544 was already removed in #2551

rebase

Increase BUFFER_SIZEs and add a safeguard; supply GEMM_R for POWER8/9

As shown in #2538, default buffersizes on some platforms were smaller than required in memory.c
and the requirement could never be fulfilled for a calculated GEMM_R on PPC given the fomula used

rebase

Add API to set thread affinity on Linux.

libname: treat FreeBSD and DragonFly like linux and sunos

Add a GENERIC target for 64bit MIPS

Match thread count in cpp_thread_test to host capability

Using "make TARGET=GENERIC" on loongson platform will get the following
error messages:
"make[1]: *** No rule to make target 'sgemm_incopy.o', needed by 'libs'"
Add kernel/mips64/KERNEL.generic to slove the problem.

Issue: #2545

* Add another memory barrier in memory.c to prevent races in memory slot allocation

* Add an all-core test on Drone.io's ThunderX platform and modify dgemm_tester to use all 96 cores

Add a Z13 build to the Travis configuration (#2542)

Revert 42 z12ci to keep forked develop clean

This reverts commit 7972beb375.

* Add IBM Z to Travis configuration

* Add IBM Z to Travis configuration

There is no difference in the way libnames are handle between FreeBSD
and linux or sunos. FreeBSD and DragonFly prefers having sonames as well

rebase

* Add an ARMV7 iOS build on Travis

* thread_local appears to be unavailable on ARMV7 iOS

* Add no-thumb option for ARMV7 IOS build to get it to accept DMB ISH

* Make local labels in macros of nrm2_vfpv3.S compatible with the xcode assembler

Add "recursive" option for LAPACK builds with ifort or pgfort as well

as shown in Reference-LAPACK issue 401 (their PR 403)

Fix zero initialization for beta=0 case

use immediate initialization instead of multiplication in case register content is a NaN

Fix avx512 sgemm performance bug when ldc is a multiple of 1024

Use runtime check for AVX512 capability in DYNAMIC_ARCH builds made on SKX