Fixes: https://github.com/OpenMathLib/OpenBLAS/issues/4366

cc.cmake: add optflags for G5 and G4 kernels

Replace two vector loads with one vector pair load.

Fix arch detection with CMake build for PowerPC

Improve Windows threading performance scaling

Set tail policy to undisturbed for RVV intrinsics accumulators

Fixes RVV masked intrinsics for iamax/iamin/imax/imin kernels

fix typo

Add 15 level1 optimizations for LoongArch.

Fix keyword used to count successful tests (Reference-LAPACK PR 954)

Fix memory leak in LAPACK testing framework (Reference-LAPACK PR 953)

Add LAPACK tests for the Dynamic Mode Decomposition functions from Reference-LAPACK PR 736

Use 64bit build on `CMAKE_SYSTEM_PROCESSOR=i386` on Darwin

The RVV kernel generation script uses the provided LMUL to increase the number of accumulator registers.
Since the effect of the LMUL is to group together the vector registers into larger ones, it actually should be used as a multiplier in the calculation of vlenmax.
At the moment, no matter what LMUL is provided, the generated kernels would only set the maximum number of vector elements equal to VLEN/SEW.
Commit changes the use of LMUL to properly adjust vlenmax. Note that an increase in LMUL results in a decrease in the number of effective vector registers.

Current RVV x280 target depends on vlen=512-bits for Level 3 operations.
Commit adds generic target that supports vlen=128-bits.
New target uses the same scalable kernels as x280 for Level 1&2 operations, and autogenerated kernels for Level 3 operations.
Functional correctness of Level 3 operations tested on vlen=128-bits using QEMU v8.1.1 for ctests and BLAS-Tester.