[MPS] Solve contiguos view tensors using arrayViews instead of blits (#146)

[DenisVieriu97]

Solve contiguous view tensors using arrayViews directly instead of performing blit or gather.

E.g in case of the following example:

x = torch.tensor([1,2,3,4], device="mps')
y = x[2:]
r = y + 2

Previously, y would be materialized using a gather or a blit. With this change, the memory of y is aliased directly using arrayViews, thus skipping the need for blit or gather.

Fixes #85297, #86048

[pytorch-bot]

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As of commit f4d9f04:

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• linux-focal-rocm5.3-py3.8 / test (default, 2, 2, linux.rocm.gpu)

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[DenisVieriu97]

@pytorchbot rebase

[pytorchmergebot]

@pytorchbot successfully started a rebase job. Check the current status here

[pytorchmergebot]

Successfully rebased contiguous_view_optimizations onto refs/remotes/origin/viable/strict, please pull locally before adding more changes (for example, via git checkout contiguous_view_optimizations && git pull --rebase)

[razarmehr]

LGTM

[DenisVieriu97]

@pytorchbot rebase

[pytorchmergebot]

@pytorchbot successfully started a rebase job. Check the current status here

[pytorchmergebot]

Successfully rebased contiguous_view_optimizations onto refs/remotes/origin/viable/strict, please pull locally before adding more changes (for example, via git checkout contiguous_view_optimizations && git pull --rebase)

[DenisVieriu97]

@pytorchbot merge -g

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[pytorchmergebot]

Merge failed

Reason: 2 additional jobs have failed, first few of them are: trunk ,trunk / linux-focal-rocm5.3-py3.8 / test (default, 2, 2, linux.rocm.gpu)

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Raised by workflow job

[DenisVieriu97]

@pytorchbot merge -f "Lint+MPS is green"

[pytorchmergebot]

Merge started

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