Merge pull request #11450 from jacquesqiao/fix-prefetch-bug

outvar must be create in local scope for prefetch

paddle/fluid/operators/detail/grpc_server.cc

@@ -169,7 +169,8 @@ class RequestPrefetch final : public RequestBase {
 
     auto scope = request_->GetMutableLocalScope();
     auto invar = scope->FindVar(in_var_name);
-    framework::Variable* outvar = scope->FindVar(out_var_name);
+    // out var must be created in local scope!
+    framework::Variable* outvar = scope->Var(out_var_name);
 
     request_handler_->Handle(in_var_name, scope, invar, &outvar, out_var_name);