[clang] [CIR][NEON] Add lowering support for `vceqzd_s64` (PR #179779)

[Andy Kaylor via cfe-commits]

================
@@ -406,6 +406,8 @@ def calculate_arch_features(arch_string):
 if config.have_llvm_driver:
     config.available_features.add("llvm-driver")
 
+if config.clang_enable_cir:
+    config.available_features.add("cir")
----------------
andykaylor wrote:

```suggestion
    config.available_features.add("cir-enabled")
```
This would make the run lines a bit longer but I think also more readable.

https://github.com/llvm/llvm-project/pull/179779