fix npu c_allgather int64 (#39099)

paddle/fluid/operators/collective/c_allgather_op_npu.cc

@@ -79,5 +79,6 @@ namespace plat = paddle::platform;
 
 REGISTER_OP_NPU_KERNEL(c_allgather, ops::CAllGatherOpASCENDKernel<int8_t>,
                        ops::CAllGatherOpASCENDKernel<int>,
+                       ops::CAllGatherOpASCENDKernel<int64_t>,
                        ops::CAllGatherOpASCENDKernel<float>,
                        ops::CAllGatherOpASCENDKernel<plat::float16>);

paddle/fluid/platform/device/npu/hccl_helper.h

@@ -41,6 +41,8 @@ inline HcclDataType ToHCCLDataType(framework::proto::VarType::Type type) {
     return HCCL_DATA_TYPE_FP32;
   } else if (type == framework::proto::VarType::FP16) {
     return HCCL_DATA_TYPE_FP16;
+  } else if (type == framework::proto::VarType::INT64) {
+    return HCCL_DATA_TYPE_INT64;
   } else if (type == framework::proto::VarType::INT32) {
     return HCCL_DATA_TYPE_INT32;
   } else if (type == framework::proto::VarType::INT8) {