Fix compile error with Intel oneAPI compiler

[iskunk]

I am building PyTorch with the Intel oneAPI 2024.0.0 compiler, and encountered this compile error:

[ 85%] Building CXX object caffe2/CMakeFiles/cpu_rng_test.dir/__/aten/src/ATen/test/cpu_rng_test.cpp.o
In file included from /home/src/pytorch/aten/src/ATen/test/cpu_rng_test.cpp:2:
/home/src/pytorch/aten/src/ATen/test/rng_test.h:119:41: error: loop variable 'to' creates a copy from type 'const ::std::optional<int64_t>' (aka 'const optional<long>') [-Werror,-Wrange-loop-construct]
  119 |     for (const ::std::optional<int64_t> to : tos) {
      |                                         ^
/home/src/pytorch/aten/src/ATen/test/rng_test.h:119:10: note: use reference type 'const ::std::optional<int64_t> &' (aka 'const optional<long> &') to prevent copying
  119 |     for (const ::std::optional<int64_t> to : tos) {
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                                         &
1 error generated.

This change makes the compiler happy.

[pytorch-bot]

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[colesbury]

@pytorchbot merge

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