[clang] [CIR][NVPTX] Lower __nvvm_bar0_{and, or, popc} builtins (PR #221255)

[Andy Kaylor via cfe-commits]

================
@@ -69,6 +69,23 @@ static mlir::Value emitUnaryNVVMIntrinsic(CIRGenFunction &cgf,
       .getResult();
 }
 
+static mlir::Value emitBar0Reduction(CIRGenFunction &cgf, const CallExpr *expr,
+                                     llvm::StringRef intrinsicName,
+                                     bool returnsPred) {
+  CIRGenBuilderTy &builder = cgf.getBuilder();
+  mlir::Location loc = cgf.getLoc(expr->getExprLoc());
+  mlir::Value zero = builder.getConstInt(loc, builder.getSInt32Ty(), 0);
----------------
andykaylor wrote:

```suggestion
  mlir::Type si32Ty = builder.getSInt32Ty();
  mlir::Value zero = builder.getZero(loc. si32Ty);
```

https://github.com/llvm/llvm-project/pull/221255