This patch adds dgemm_kernel_4x8_skylakex.c which is
* dgemm_kernel_4x8_haswell.s converted to C + intrinsics
* 8x8 support added
* 8x8 kernel implemented using AVX512

Performance is a work in progress, but already shows a 10% - 20%
increase for a wide range of matrix sizes.

Convert fldmia/fstmia instructions to UAL syntax for clang7

second part of fix for #1774, containing files missed in #1775

test_axpy work error on LOONGSON3A platform #1777

Convert fldmia/fstmia instructions to UAL syntax for clang7

fixes #1774

Include thread numbers in failure message from blas_thread_init

to aid in debugging cases like #1767

Add `$(LDFLAGS)` to `$(CC)` and `$(FC)` invocations within `exports/Makefile`

* Document the stub status of the QUAD_PRECiSION code inherited from GotoBLAS2

in response to #1769

Do not use the new TLS-enabled memory allocator for non-threaded builds, and disable TLS by default in gmake as well

Allow to install the 'interface64' version concurrently with the regular version

Add explicit casts to silence compiler warnings

for #1766

Workaround for #1761 as that exposed a problem in the new code (which was intended to speed up multithreaded code only anyway).

Update branch

for #1710

for #1710

Remove an unused variable from several LAPACKE 2stage_work functions

Copied from Reference-LAPACK PR283

Copied from Reference-LAPACK PR283

Copied from Reference-LAPACK PR283

fix small typo in strmm_ LN

Follow netlib renaming/aliasing CBLAS_ORDER to CBLAS_LAYOUT

Fix ARMV8 cross-compilation for IOS

to avoid having to change all instances of enum CBLAS_ORDER in this file

fixes #1754

Assume cross-compilation if host and target os differ

fixes 1674

Set USE_TRMM for all ZARCH variants to fix TRMM faults with zarch-gen…

Fix missing replacements of ILAENV by ILAENV_2STAGE (lapack PR 272)

fixes #1743

This could cause spurious "parameter has an illegal value" errors in DSYEVR and related routines, see https://github.com/Reference-LAPACK/lapack/issues/262

Add combination of old and new thread memory code selectable by new option USE_TLS