[mlir][bufferization] Fix SimplifyClones with dealloc before cloneOp (#79098)

The SimplifyClones pass relies on the assumption that the deallocOp
follows the cloneOp. However, a crash occurs when there is a
redundantDealloc preceding the cloneOp. This PR addresses the issue by
ensuring the presence of deallocOp after cloneOp. The verification is
performed by checking if the loop of the sub sequent node of cloneOp
reaches the tail of the list.

Fix #74306

Author: sott0n

mlir/lib/Dialect/Bufferization/IR/BufferizationOps.cpp

@@ -505,6 +505,9 @@ struct SimplifyClones : public OpRewritePattern<CloneOp> {
     // of the source.
     for (Operation *pos = cloneOp->getNextNode(); pos != redundantDealloc;
          pos = pos->getNextNode()) {
+      // Bail if we run out of operations while looking for a deallocation op.
+      if (!pos)
+        return failure();
       auto effectInterface = dyn_cast<MemoryEffectOpInterface>(pos);
       if (!effectInterface)
         continue;

mlir/test/Dialect/Bufferization/canonicalize.mlir

@@ -235,6 +235,18 @@ func.func @clone_and_realloc(%arg0: memref<?xf32>) {
 
 // -----
 
+// Verify SimplifyClones skips clones with preceding deallocation.
+// CHECK-LABEL: @clone_and_preceding_dealloc
+func.func @clone_and_preceding_dealloc(%arg0: memref<?xf32>) -> memref<32xf32> {
+  memref.dealloc %arg0 : memref<?xf32>
+  %0 = bufferization.clone %arg0 : memref<?xf32> to memref<32xf32>
+  return %0 : memref<32xf32>
+}
+// CHECK-SAME: %[[ARG:.*]]: memref<?xf32>
+// CHECK-NOT: %cast = memref.cast %[[ARG]]
+
+// -----
+
 // CHECK-LABEL: func @tensor_cast_to_memref
 //  CHECK-SAME:   %[[ARG0:.+]]: tensor<4x6x16x32xi8>
 func.func @tensor_cast_to_memref(%arg0 : tensor<4x6x16x32xi8>) ->