gh-117394: Reduce syscalls for `posixpath.ismount`#117395

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nineteendo wants to merge 5 commits intopython:mainfrom

nineteendo:speedup-posixpath.ismount

Commits on Mar 30, 2024

Commits on Apr 1, 2024

Fix `ismount('/mnt/storage/link/storage')`
nineteendo
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Commits on Apr 2, 2024

monkey patch `os.stat`
nineteendo
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