[MLIR][Operation] Fix isBeforeInBlock crash bug mentioned in https://github.com/llvm/llvm-project/issues/60909

mlir/lib/IR/Operation.cpp

@@ -406,7 +406,7 @@ void Operation::updateOrderIfNecessary() {
   assert(block && "expected valid parent");
 
   // If the order is valid for this operation there is nothing to do.
-  if (hasValidOrder())
+  if (hasValidOrder() || llvm::hasSingleElement(*block))
     return;
   Operation *blockFront = &block->front();
   Operation *blockBack = &block->back();

mlir/test/Pass/scf-to-cf-and-print-liveness.mlir

@@ -0,0 +1,20 @@
+// RUN: mlir-opt %s -pass-pipeline="builtin.module(func.func(convert-scf-to-cf), func.func(test-print-liveness))"
+
+module {
+  func.func @for_if_for(%arg0: index, %arg1: index, %arg2: index, %arg3: i1) {
+    %cst = arith.constant dense<0.000000e+00> : tensor<128x32xf16>
+    %0 = scf.for %arg4 = %arg0 to %arg1 step %arg2 iter_args(%arg5 = %cst) -> (tensor<128x32xf16>) {
+      %1 = scf.if %arg3 -> (tensor<128x32xf16>) {
+        scf.yield %arg5 : tensor<128x32xf16>
+      } else {
+        %2 = scf.for %arg6 = %arg0 to %arg1 step %arg2 iter_args(%arg7 = %arg5) -> (tensor<128x32xf16>) {
+          scf.yield %arg7 : tensor<128x32xf16>
+        }
+        scf.yield %2 : tensor<128x32xf16>
+      }
+      scf.yield %1 : tensor<128x32xf16>
+    }
+
+    return
+  }
+}