[GCC9][Werror]fix -Werror=maybe-uninitialized

[engineer1109]

PR types

Bug fixes

PR changes

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Describe

新出现的-Werror=maybe-uninitialized 错误
务必记得phi::vectorize 套用dims

auto in_dims = phi::vectorize(in->dims());

不用vectorize 就会报错Werror

auto in_dims = in->dims();

Log

[ 79%] Building CXX object paddle/fluid/operators/detection/CMakeFiles/roi_perspective_transform_op.dir/roi_perspective_transform_op.cc.o
/media/wjl/D2/github/fork/10/Paddle/paddle/fluid/operators/detection/roi_perspective_transform_op.cc: In member function ‘void paddle::operators::CPUROIPerspectiveTransformOpKernel<T>::Compute(const paddle::framework::ExecutionContext&) const [with T = float]’:
/media/wjl/D2/github/fork/10/Paddle/paddle/fluid/operators/detection/roi_perspective_transform_op.cc:262:9: error: ‘*((void*)& in_dims +24)’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  262 |     int in_width = in_dims[3];
      |         ^~~~~~~~
/media/wjl/D2/github/fork/10/Paddle/paddle/fluid/operators/detection/roi_perspective_transform_op.cc:261:9: error: ‘*((void*)& in_dims +16)’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  261 |     int in_height = in_dims[2];
      |         ^~~~~~~~~
/media/wjl/D2/github/fork/10/Paddle/paddle/fluid/operators/detection/roi_perspective_transform_op.cc:259:10: error: ‘*((void*)& in_dims +8)’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  259 |     auto in_dims = in->dims();

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[engineer1109]

#47143

[engineer1109]

@zhiqiu CI 已经结束

[zhiqiu]

Suggested change

	auto in_dims = phi::vectorize(in->dims());
	const auto & in_dims = in->dims()

[engineer1109]

@zhiqiu 已经修改，本地编译通过

[zhiqiu]

LGTM