[Easy] Fix "comparison of unsigned integer with zero" warning

[peterbell10]

Stack from ghstack (oldest at bottom):

• -> [Easy] Fix "comparison of unsigned integer with zero" warning #109882
• Move at::{Refcounted,}MapAllocator to c10 #109881

This fixes a warning that pops up in nvcc:

[1495/1767] Building CUDA object caffe2/CMak...dir/__/aten/src/ATen/native/cuda/Unique.cu.o
/home/pbell/git/pytorch/aten/src/ATen/core/ivalue.h(1283): warning #186-D: pointless comparison of unsigned integer with zero
      while (false) if (!(uint32_t(tag) >= 0 && uint32_t(tag) < kNumTags)) { ::c10::detail::torchInternalAssertFail( __func__, "/home/pbell/git/pytorch/aten/src/ATen/core/ivalue.h", static_cast<uint32_t>(1283), "uint32_t(tag) >= 0 && uint32_t(tag) < kNumTags" " INTERNAL ASSERT FAILED at " "\"/home/pbell/git/pytorch/aten/src/ATen/core/ivalue.h\"" ":" "1283" ", please report a bug to PyTorch. ", c10::str("unexpected tag ", static_cast<int>(tag))); }

[pytorch-bot]

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❌ 1 New Failure

As of commit ebd9d47 with merge base ebc7039 ():

NEW FAILURE - The following job has failed:

• linux-focal-cuda12.1-py3.10-gcc9-bazel-test / build-and-test (default, 1, 1, linux.4xlarge.nvidia.gpu) (gh)

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