Mmap windows

[JacobSzwejbka]

Current windows implementation had issues with 64 bit files. This expands the coverage to work properly and add some tests

[pytorch-bot]

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• ROCm failures during provisioning step due to network issues

❌ 1 New Failure

As of commit 8d2761a with merge base 8c92793 ():

NEW FAILURE - The following job has failed:

• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 255

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[meta-codesync]

@JacobSzwejbka has imported this pull request. If you are a Meta employee, you can view this in D86144946.

[lucylq]

So, having out_size as a size_t* should not pose an issue as we wouldn't be able to map >4gb on 32bit system anyways, right?

[JacobSzwejbka]

Yeah

[lucylq]

LGTM, thanks for adding the test!

cc @SS-JIA for windows changes as well.