[clang] [llvm] [SVE2.1][Clang][LLVM]Add 128bits builtin in Clang and LLVM intrinisc (PR #71930)

[Momchil Velikov via llvm-commits]

https://github.com/momchil-velikov commented:

In addition to the code comments:
In the (tentative) commit message the prototype `svuint8_t svextq_lane[_u8](svuint8_t zdn,` is cut short.
The prototype of `svint8_t svtbxq[_s8](svint8_t zn, svuint8_t zm);` is missing an parameter.
The attribution tag should be `Co-authored-by:`


https://github.com/llvm/llvm-project/pull/71930