[clang] [Clang][CIR] Add vqshlud and vqshld AArch64 builtins (PR #190728)

[Kartik Ohlan via cfe-commits]

Ko496-glitch wrote:

@banach-space  i added the test cases to intrinsics.c however there is one concern.  The instructions for test file was to use 

```
// LLVM-LABEL: @test_vduph_lane_bf16
// CIR-LABEL: @vduph_lane_bf16(
bfloat16_t test_vduph_lane_bf16(bfloat16x4_t v) {
  // CIR:

  // LLVM:
  return (...)
}

```

but in my case i have  the extra _test in CIR-LABEL, any suggestions on how i can fix this or is this fine ? 
```

// LLVM-LABEL: @test_vqshlud_n_s64(
// CIR-LABEL: @test_vqshlud_n_s64(
int64_t test_vqshlud_n_s64(int64_t a) {
```


https://github.com/llvm/llvm-project/pull/190728