POWER10 optimizations are disabled when using default AIX assembler.
As we have fixed many issues recently, enabling optimization path
for default assembler.

This patch increases the macro size limit from 4096 to 16384 to
allow compiling larger assembly files in AIX.
Tested with GCC and IBM Open XL C.

POWER10: Fix compilation issues with Open XL C

This patch removes intermediate m4 conversions used in sbgemm
compilation as it is not needed for .c files.
Tested on AIX with gcc and IBM Open XL C.

As cgemm and zgemm kernels are not optimized for big endian falling
back to POWER8 versions.  Tested on AIX using gcc and Open XL C.

This patch fixes errors when using Open XL C compiler on AIX.
Tested with gcc/xlf and ibm-clang/xlf compiler combinations.

Modernize obsolete inline order

__loongarch_grlen and __loongarch_frlen were introduced in gcc version 8.3.0
(Loongnix 8.3.0-6.lnd.vec.31) internally within Loongson to standardize the
general and floating-point register widths. However, previous versions did
not have them, requiring additional checks to be added.

Work around miscompilation of zdot_thunderx2t99 by the current NVIDIA HPC compiler

Work around LLVM17 miscompiling the AVX512 microkernels for CASUM/ZASUM

Fix cooperlake and sapphire rapids march flags on clang

__builtin_vsx_assemble_pair was only in GCC 10-11.2 and was replaced by
__builtin_vsx_build_pair thereafter.

The march=cooperlake and march=sapphirerapids flags were never getting
added when building with Clang targetting those architectures. Instead
it was falling back to the skylake AVX512 implementation.

Clang added support for these two architectures in Clang 9 and Clang 12,
so introduce new checks for those versions to enable the appropriate
march flag, and fallback to skylake otherwise.

LoongArch64: Update dgemm kernel

Apply USE_TRMM to MIPS64_GENERIC as to GENERIC in gmake builds

LoongArch64: Add dgemv_t_8_lasx.S and dgemv_n_8_lasx.S

Enable use of AVX512 microkernels with NVIDIA HPC from version 22.3