[export] Don't create a new fake mode if dynamo tracing

[angelayi]

Fixes #ISSUE_NUMBER

[pytorch-bot]

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[mikekgfb]

Thank you!

[facebook-github-bot]

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

[angelayi]

@pytorchbot merge

[pytorchmergebot]

Merge failed

Reason: This PR needs a release notes: label
If your changes are user facing and intended to be a part of release notes, please use a label starting with release notes:.

If not, please add the topic: not user facing label.

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[angelayi]

@pytorchbot merge

[pytorchmergebot]

Merge started

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[pytorchmergebot]

Merge failed

Reason: 12 mandatory check(s) failed. The first few are:

• pull / linux-focal-py3.12-clang10 / test (default, 1, 3, linux.2xlarge)
• pull / linux-focal-py3.12-clang10 / test (dynamo, 2, 3, linux.2xlarge)
• pull / linux-focal-py3.11-clang10 / test (default, 1, 3, linux.2xlarge)
• pull / linux-focal-py3.11-clang10 / test (crossref, 1, 2, linux.2xlarge)
• pull / linux-focal-py3.11-clang10 / test (dynamo, 2, 3, linux.2xlarge)

Dig deeper by viewing the failures on hud

Details for Dev Infra team

Raised by workflow job

Failing merge rule: Core Maintainers

[facebook-github-bot]

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

[facebook-github-bot]

@pytorchbot merge -f 'Landed internally'

(Initiating merge automatically since Phabricator Diff has merged, using force because this PR might not pass merge_rules.json but landed internally)

[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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