fix the gemm bug related to alexnet test.

src/targets/gpu/gemm.cpp

 #include <migraphx/gpu/gemm.hpp>
 #include <migraphx/gpu/context.hpp>
+#include <migraphx/gpu/device/add.hpp>
 
 namespace migraphx {
 inline namespace MIGRAPHX_INLINE_NS {
@@ -186,10 +187,11 @@ argument miopen_gemm::compute(context& ctx,
     {
         output_shape.visit_type([&](auto as) {
             auto to_pointer = [&](auto&& arg) { return to_rocblas_type(as.from(arg.data())); };
-            hipMemcpy(to_pointer(args[3]),
+            hipMemcpyAsync(to_pointer(args[3]),
                       to_pointer(args[2]),
                       output_shape.bytes(),
-                      hipMemcpyDeviceToDevice);
+                      hipMemcpyDeviceToDevice,
+                      ctx.get_stream().get());
         });
 
         output_shape.visit_type([&](auto as) {
@@ -233,6 +235,7 @@ argument miopen_gemm::compute(context& ctx,
                 m * n,
                 num_matrices);
         });
+        //device::add(ctx.get_stream().get(), args[3], args[2], args[3]);
 
         return args[3];
     }