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gh-117641: Improve the perfornance of posixpath.commonpath() (#117652)

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Original file line number	Diff line number	Diff line change
`@@ -550,7 +550,7 @@ def commonpath(paths):`
`550`	`550`	`split_paths= [path.split(sep)forpathinpaths]`
`551`	`551`
`552`	`552`	`try:`
`553`		`-isabs,=set(p[:1]==sepforpinpaths)`
	`553`	`+isabs,={p.startswith(sep)forpinpaths}`
`554`	`554`	`exceptValueError:`
`555`	`555`	`raiseValueError("Can't mix absolute and relative paths")fromNone`
`556`	`556`

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Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	+Speedup:func:`os.path.commonpath` on Unix.

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