Extract ExtraMeta symbolic shape fields into a dedicated SymbolicShap… (#98399)
…eMeta
This modularizes ExtraMeta to bring down its creation cost when it is needed for other functions than syn shape handling.
Change-Id: Ife59b201b0c4fd75090fe8be5171a6dd73a10d10
Fixes #ISSUE_NUMBER
Pull Request resolved: https://github.com/pytorch/pytorch/pull/98399
Approved by: https://github.com/ezyang
