Fix test failure from 84f0906

Signed-off-by: Whitney Tsang <[email protected]>

Author: whitneywhtsang

test/Conversion/intel/tritongpu_to_gen.mlir

@@ -626,6 +626,7 @@ module attributes {"ttg.num-ctas" = 1 : i32, "ttg.num-warps" = 4 : i32} {
     // CHECK-NEXT: llvm.mlir.constant(512 : i32) : i32
     // CHECK-NEXT: llvm.add
     // CHECK-NEXT: llvm.add
+    // CHECK-NEXT: llvm.mlir.undef
     // CHECK-NEXT: llvm.mlir.constant(0 : i32) : i32
     // CHECK-NEXT: llvm.mul
     // CHECK-NEXT: llvm.add