Caffe2 generate_proposals_op_gpu_test crashes on Windows

[malfet]

See https://app.circleci.com/pipelines/github/pytorch/pytorch/148057/workflows/df15651f-11ba-4459-8687-cd11a2a13b15/jobs/4987650

unning "C:\Users\circleci\project\build\win_tmp\build\torch\test\generate_proposals_op_gpu_test.exe"
Running main() from ..\third_party\googletest\googletest\src\gtest_main.cc
[==========] Running 1 test from 1 test case.
[----------] Global test environment set-up.
[----------] 1 test from GenerateProposalsTest
[ RUN      ] GenerateProposalsTest.TestRealDownSampledGPU
+ cleanup

[cyyever]

It is fixed now.