Implement create_dir_all() to operate iteratively instead of recursively#148196

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asder8215 wants to merge 2 commits intorust-lang:mainfrom

asder8215:std-fs-iterative-create-dir-all

Commits on Dec 14, 2025

create_dir_all() operates iteratively instead of recursively
asder8215
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check if current path is root through seeing if its parent is None
asder8215
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