Fix a bug in BroadcastConfig for KP XPU2 rec model (#42866)

paddle/phi/kernels/primitive/datamover_primitives_xpu2.h

@@ -70,6 +70,7 @@ struct BroadcastConfig {
   int strides_out[phi::DDim::kMaxRank];
   int in_dim[phi::DDim::kMaxRank];
   int dim_after_cmp[phi::DDim::kMaxRank];
+  int y_dim_after_cmp[phi::DDim::kMaxRank];
   int dim_size_after_cmp = 0;
   int cmp_res = 0;
   OptType cmp_type = OptType::CanNotOptimize;
@@ -82,7 +83,7 @@ struct BroadcastConfig {
 
   HOSTDEVICE BroadcastConfig(const std::vector<int64_t>& out_dims,
                              const std::vector<int64_t>& in_dims,
-                             const std::vector<int64_t>& another_in_dims,
+                             const std::vector<int64_t>& y_in_dims,
                              int dim_size) {
     std::vector<int> strides_in_tmp;
     std::vector<int> strides_out_tmp;
@@ -103,8 +104,8 @@ struct BroadcastConfig {
     memcpy(strides_out, strides_out_tmp.data(), kDims * sizeof(int));
     memcpy(in_dim, dim_tmp.data(), kDims * sizeof(int));
 
-    cmp_res = get_mnk_for_broadcast_ops(in_dims, another_in_dims);
-    get_opt_type(another_in_dims);
+    cmp_res = get_mnk_for_broadcast_ops(in_dims, y_in_dims);
+    get_opt_type();
     buf_len = get_buf_len();
   }
 
@@ -154,7 +155,7 @@ struct BroadcastConfig {
     return index_src;
   }
 
-  void get_opt_type(const std::vector<int64_t>& y_dim_after_cmp) {
+  void get_opt_type() {
     if (dim_size_after_cmp == 1) {
       if (dim_after_cmp[0] == 1 && y_dim_after_cmp[0] != 1) {  // {1} op {n}
         n = y_dim_after_cmp[0];
@@ -241,6 +242,7 @@ struct BroadcastConfig {
     int cmp_x = 0;
     int cmp_y = 0;
     bool is_same = false;
+
     std::vector<int64_t> xshape_after_remove_ones = xshape;
     std::vector<int64_t> yshape_after_remove_ones = yshape;
     // first step: remove excess ones
@@ -275,6 +277,7 @@ struct BroadcastConfig {
       }
       idx = idx + 1;
       dim_after_cmp[after_cmp_idx] = cmp_x;
+      y_dim_after_cmp[after_cmp_idx] = cmp_y;
       after_cmp_idx++;
       if (idx == xshape_after_remove_ones.size()) {
         dim_size_after_cmp = after_cmp_idx;