Fix flaky test-liveness lit test (#2724)

Signed-off-by: Tiotto, Ettore <[email protected]>

Author: etiotto

test/Analysis/test-liveness.mlir

@@ -18,7 +18,7 @@ module attributes {"triton_gpu.num-warps" = 8 : i32} {
     // CHECK-NEXT:  [[[ADVANCE2]], scf.yield] for value: [[ADVANCE2]]
 
     // CHECK: scf.if
-    // CHECK-NEXT: LiveIntervals for block: ^bb0
+    // CHECK-DAG: LiveIntervals for block: ^bb0
     // CHECK-DAG:  [[[LOAD1:%.*]], [[LOAD1]]] for value: %arg0
     // CHECK-DAG:  [[[LOAD1]], scf.yield] for value: [[LOAD1]]
     // CHECK-DAG: LiveIntervals for block: ^bb0