Further Power8 big-endian corrections

Fix the integer overflow issue for large matrix size

Signed-off-by: Wang, Long <long1.wang@intel.com>

For large matrix, e.g. M=N=K, and M>1290, int mnk=M*N*K will overflow.
This will lead to wrong branching to single-threading. The performance
is downgraded significantly.

Signed-off-by: Wang, Long <long1.wang@intel.com>

Fix PPC440 big-endian support and disable the QCDOC qalloc routine by default

1. qalloc() appears to have been a special routine written for the PPC440-based QCDOC supercomputer(s) from around 2005, its source does not seem to be readily available. So switch the #if 1 in the code to rely on standard malloc() by default.
2. Utility functions like get_num_procs, get_num_threads that were added to the "normally" used memory.c in the meantime were still missing here.

rebase

Fix PPC970 big-endian support

The altivec versions of SGEMM and CGEMM fail most test in LAPACK-TESTING when compiled for big endian, STRSM/CTRSM even cause segfaults. The rot kernels either fail the corresponding utest or lead to failures in LAPACK-TESTING.

as the respective PPC970 "altivec" kernels give wrong results when compiled for big endian

Fix potential issue in the c/z blas3 ctests

AVX512 CGEMM & ZGEMM kernels

96-99% 1-thread performance of MKL2018

rebase

Optimize SGEMM on SKYLAKEX CPUs

Disable three-operand DCBT on PPC970 regardless of operating system

Disable IDAMIN/MAX and IZAMIN/MAX optimizations on big-endian POWER8

Remove obsolete workarounds for IOS on ARMV8

There seems to be no advantage to the three-operand form used in the earliest GotoBLAS kernels, and it causes compilation problems  on other than the previously special-cased platforms as well

resync with upstream

Fixed a minor cmake problem, occuring when DYNAMIC_ARCH=ON and CMAKE_C_FLAGS was empty

Add support for NetBSD by adding it to the existing xBSD conditionals

Both forms are seen on NetBSD (#2288)

Improve support for g95 and non-GNU ld

Fix netlib 3.7/3.8 function enumeration for linktest

Optimize RPCC function on ARM64

Fixup x86 cpuid changes from #2283

Auto-add "-fno-second-underscore" option to make LAPACKE compile (as it calls LAPACK functions that may have gotten a second underscore added otherwise). Also support -R for rpath when parsing compiler directives in f_check

to allow linktest to pass with a compiler that adds a second underscore to such names