[dynamic shapes][real tensor tracing] propagate unbacked hint when creating mod replacement

[pianpwk]

Fixes data-dependent errors for 2 PT2I models in draft export

cc @ezyang @SherlockNoMad @EikanWang @jgong5 @wenzhe-nrv

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@pianpwk has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

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@pianpwk has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

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@pytorchbot merge

(Initiating merge automatically since Phabricator Diff has merged)

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[pytorchmergebot]

Merge failed

Reason: 1 jobs have failed, first few of them are: trunk / macos-py3-arm64 / build

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[pianpwk]

@pytorchmergebot merge -f

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❌ 🤖 pytorchbot command failed:

@pytorchbot merge: error: argument -f/--force: expected one argument

usage: @pytorchbot merge [-f MESSAGE | -i] [-ic] [-r [{viable/strict,main}]]

Try @pytorchbot --help for more info.

[pianpwk]

@pytorchmergebot merge -f "due to SEV"

[pytorchmergebot]

Merge started

Your change will be merged immediately since you used the force (-f) flag, bypassing any CI checks (ETA: 1-5 minutes). Please use -f as last resort and instead consider -i/--ignore-current to continue the merge ignoring current failures. This will allow currently pending tests to finish and report signal before the merge.

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