[CIR][AArch64] add vshr_* builtins (#186693)
Part of https://github.com/llvm/llvm-project/issues/185382
- Moved lowering logic from clangir incubator to upstream
- Added tests, partially reusing tests from
[neon-intrinsics.c](https://github.com/llvm/llvm-project/blob/main/clang/test/CodeGen/AArch64/neon-intrinsics.c)
and
[neon.c](https://github.com/llvm/clangir/blob/main/clang/test/CIR/CodeGen/AArch64/neon.c)
- Made sure that all intrinsics from [Neon
ACLE](https://arm-software.github.io/acle/neon_intrinsics/advsimd.html#vector-shift-right)
are implemented and tested
