Fix bad rebase: remove unusued get_max_block_size function from CUDA backend.

Author: brycelelbach

thrust/system/cuda/detail/core/util.h

@@ -491,51 +491,6 @@ namespace core {
       return 0;
   }
 
-  template <class Kernel>
-  int CUB_RUNTIME_FUNCTION
-  get_max_block_size(Kernel k)
-  {
-    int devId;
-    cuda_cub::throw_on_error(cudaGetDevice(&devId),
-                   "get_max_block_size :"
-                   "failed to cudaGetDevice");
-
-    cudaOccDeviceProp occ_prop;
-    cuda_cub::throw_on_error(get_occ_device_properties(occ_prop, devId),
-                   "get_max_block_size: "
-                   "failed to cudaGetDeviceProperties");
-
-
-    cudaFuncAttributes attribs;
-    cuda_cub::throw_on_error(cudaFuncGetAttributes(&attribs, reinterpret_cast<void *>(k)),
-                   "get_max_block_size: "
-                   "failed to cudaFuncGetAttributes");
-    cudaOccFuncAttributes occ_attrib(attribs);
-
-
-    cudaFuncCache cacheConfig;
-    cuda_cub::throw_on_error(cudaDeviceGetCacheConfig(&cacheConfig),
-                   "get_max_block_size: "
-                   "failed to cudaDeviceGetCacheConfig");
-
-    cudaOccDeviceState occ_state;
-    occ_state.cacheConfig      = (cudaOccCacheConfig)cacheConfig;
-    int          block_size    = 0;
-    int          min_grid_size = 0;
-    cudaOccError occ_status    = cudaOccMaxPotentialOccupancyBlockSize(&min_grid_size,
-                                                                    &block_size,
-                                                                    &occ_prop,
-                                                                    &occ_attrib,
-                                                                    &occ_state,
-                                                                    0);
-    if (CUDA_OCC_SUCCESS != occ_status || block_size <= 0)
-      cuda_cub::throw_on_error(cudaErrorInvalidConfiguration,
-                     "get_max_block_size: "
-                     "failed to cudaOccMaxPotentialOccupancyBlockSize");
-
-    return block_size;
-  }
-
   // LoadIterator
   // ------------
   // if trivial iterator is passed, wrap loads into LDG