[inductor] Move fusion heuristics to V.choices

[jansel]

Stack from ghstack (oldest at bottom):

• -> #141108

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[pytorch-bot[bot]]

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As of commit 142cd2aca7d857238f404fcf1722cc23fa1c930e with merge base 41f315417ca8b0bda175f2ed08d3b3d856f907bc (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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[jansel]

@pytorchbot rebase

[pytorchmergebot]

@pytorchbot started a rebase job onto refs/remotes/origin/viable/strict. Check the current status here

[pytorchmergebot]

Successfully rebased gh/jansel/440/orig onto refs/remotes/origin/viable/strict, please pull locally before adding more changes (for example, via ghstack checkout https://github.com/pytorch/pytorch/pull/141108)

[jansel]

@pytorchbot merge

[pytorchmergebot]

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