Small fixes in Dependency.cmake and run_test.py (pytorch#44414)

Summary:
Do not add gencode flags to NVCC_FLAGS twice: First time they are added in `cmake/public/cuda.cmake` no need to do it again in `cmake/Dependencies.cmake`
Copy `additional_unittest_args` before appending local options to it in `run_test()` method

Pull Request resolved: pytorch#44414

Reviewed By: seemethere

Differential Revision: D23605733

Pulled By: malfet

fbshipit-source-id: 782a0da61650356a978a892fb03c66cb1a1ea26b

Author: malfet

cmake/Dependencies.cmake

@@ -1501,7 +1501,6 @@ if(NOT INTERN_BUILD_MOBILE)
   endif()
 
   list(APPEND CUDA_NVCC_FLAGS ${TORCH_NVCC_FLAGS})
-  list(APPEND CUDA_NVCC_FLAGS ${NVCC_FLAGS_EXTRA})
   if(CMAKE_POSITION_INDEPENDENT_CODE AND NOT MSVC)
     list(APPEND CUDA_NVCC_FLAGS "-Xcompiler" "-fPIC")
   endif()

test/run_test.py

@@ -217,7 +217,7 @@ def get_executable_command(options, allow_pytest):
 
 
 def run_test(test_module, test_directory, options, launcher_cmd=None, extra_unittest_args=None):
-    unittest_args = options.additional_unittest_args
+    unittest_args = options.additional_unittest_args.copy()
     if options.verbose:
         unittest_args.append('--verbose')
     if test_module in RUN_PARALLEL_BLOCKLIST: