modified team based to_all -> reduce

src/host/host.hpp

@@ -207,8 +207,7 @@ class HostInterface {
                        long* p_sync);  // NOLINT(runtime/int)
 
   template <typename T, ROC_SHMEM_OP Op>
-  __host__ void to_all(roc_shmem_team_t team, T* dest, const T* source,
-                       int nreduce);
+  __host__ int reduce(roc_shmem_team_t team, T* dest, const T* source, int nreduce);
 
   template <typename T>
   __host__ void wait_until(T *ivars, int cmp, T val,