During the last iteration of some RVV operations, accumulators can get overwritten when VL < VLMAX and tail policy is agnostic.
Commit changes intrinsics tail policy to undistrubed.

Restore zero-initialization of variables in generic ztrsm_utcopy

* Add AppleClang crossbuild to MacOS/arm64 DYNAMIC_ARCH

* add casts to disambiguate svwhilelt for clang

Changes masked intrinsics from _m to _mu and reintroduces maskedoff argument.

Sapphire Rapids sbgemm fix

This patch removes the warning messages related to unused variables in
sbgemm_kernel_power10.c.

Signed-off-by: Manjul Mohan <manjul@linux.vnet.ibm.com>

fix wrong vr = VFMVVF_FLOAT(0, vl);

[WIP] Disable gcc's tree-vectorizer for x86_64 CGEMV

Use SVE kernel for SGEMM/DGEMM on Arm(R) Neoverse(TM) V1

Propagate SWITCH_RATIO to DYNAMIC_ARCH builds

This re-spins #3869 with some additional copy unrolling which helps maintain SYRK performance.

After #3868, the SVE kernels represent a pretty good boost.

This re-uses ARMV8SVE as a base and I'm going to incrementally move everything to use ARMV8SVE in additional patches (as well as fix up anything that's not already in ARMV8SVE).

Previously dynamic builds were either using the default SWITCH_RATIO
or one from the higher level architecture; this patch ensures the
dynamic builds can use this parameter as well.

Improve the performance of sbgemm_tcopy on neoversen2

Add prefix (_riscv) for all riscv intrinsics
Update some intrinsics' parameter, like vfredxxxx, vmerge

add riscv level3 C,Z kernel functions.