Handle norm NaN value in xGESDD (Reference LAPACK PR471)

Fix possible division by zero in LAPACK xTGSJA (Reference-LAPACK PR502)

Apply MKL team fixes to the LAPACKE interfaces (Reference-LAPACK PR 534)

Add casts to prevent overflow of intermediate results

Removed spurious checks for INFO in xLACPY,xLASET after routines not returning any,and redundant requirements for ldvt in xGESVD_WORK

x86: Enable Intel CET

When Intel CET is enabled, we need to include <cet.h> in assembly codes
to mark Intel CET support and place _CET_ENDBR at the function entry.

Import packing improvements to LAPACK xLAQR from Reference-LAPACK (PR 480+535)

rebase

Correct INFO value returned by SLASQ2/DLASQ2 (Reference-LAPACK 506)

Fix division by zero in the non-x86 codepath of C/ZROTG

Add LAPACKE fixes from Reference-LAPACK PR 537

Apply fixes from Reference-LAPACK PR468 and 539 for array declarations in ?ORGBR/?UNGBR

Apply lapack-testing fix from Reference-LAPACK PR536

fixes changing back from a single OMP thread for error exit testing to the originally requested number of threads for computational tests

Apply lapack-testing fixes from Reference-LAPACK PR538

Delay creation of the (soft)link until after the library has been built

Replace spurious AVX512 requirement in the Haswell drot microkernel with an AVX2/FMA3 guard

* Add mixed clang/ifort build on OSX to the Azure CI config based on https://github.com/oneapi-src/oneapi-ci
(and remove debugging tools from the clang+gfortran job)

* Remove extraneous libgfortran dependency of ifort builds

* remove FEXTRALIB from link line of shared library as ifort keeps track of dependencies (and they are different for a .dylib than what f_check got for an executable)

rebase

Fix obscure ctest crashes on OSX and add OSX builds to Azure CI

rebase

Restore __volatile__ keyword in ARM64 DYNAMIC_ARCH detection mechanism

POWER10: Improve dgemm performance

This patch uses vector pair pointer for input load operation
which helps to generate power10 lxvp instructions.

POWER10: Optimized zgemv

This patch makes use of Matrix-Multiply Assist (MMA)
feature introduced in POWER ISA v3.1 for zgemv_n and zgemv_t.

Fix unwanted fallback to implicit typing in slanv2/dlanv2

Use "old" compute(24) function with clang due to register limitations

Pass NO_AVX512 macro def when `DYNAMIC_ARCH` is enabled