Make 'scale_op' supporting int and int64 (#5986)

* Make 'scale_op' supporting int and int64

* refine .cu file

Author: JiayiFeng

paddle/operators/scale_op.cc

@@ -77,4 +77,6 @@ REGISTER_OPERATOR(scale, ops::ScaleOp, ops::ScaleOpMaker<float>,
                   ops::ScaleGradMaker);
 REGISTER_OP_CPU_KERNEL(scale,
                        ops::ScaleKernel<paddle::platform::CPUPlace, float>,
-                       ops::ScaleKernel<paddle::platform::CPUPlace, double>);
+                       ops::ScaleKernel<paddle::platform::CPUPlace, double>,
+                       ops::ScaleKernel<paddle::platform::CPUPlace, int>,
+                       ops::ScaleKernel<paddle::platform::CPUPlace, int64_t>);

paddle/operators/scale_op.cu

@@ -16,4 +16,6 @@
 
 REGISTER_OP_GPU_KERNEL(
     scale, paddle::operators::ScaleKernel<paddle::platform::GPUPlace, float>,
-    paddle::operators::ScaleKernel<paddle::platform::GPUPlace, double>);
+    paddle::operators::ScaleKernel<paddle::platform::GPUPlace, double>,
+    paddle::operators::ScaleKernel<paddle::platform::GPUPlace, int>,
+    paddle::operators::ScaleKernel<paddle::platform::GPUPlace, int64_t>);