[Clang][AArch64][SME] Add intrinsics for adding vector elements to ZA tile

[Clang][AArch64][SME] Add intrinsics for adding vector elements to ZA tile

This patch adds support for the following SME ACLE intrinsics (as defined
in https://arm-software.github.io/acle/main/acle.html):

  - svaddha_za32[_u32]_m // also for s32
  - svaddva_za32[_u32]_m // also for s32
  - svaddha_za64[_u64]_m // also for s64
  - svaddva_za64[_u64]_m // also for s64

The _za64 versions are available only when the sme-i16i64 feature is enabled.

Co-authored-by: Sagar Kulkarni <sagar.kulkarni1@huawei.com>
Reviewed By: sdesmalen

Differential Revision: https://reviews.llvm.org/D134680