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15a8d85b1d
`containingXCToolchain` loops infinitely when given eg. `C:\foo\..\bar`.
The underlying cause is that `deletingLastPathComponent` does not remove
the `..` on Windows. On macOS it's potentially worse - it *adds* `..`.
We don't see the infinite loop on macOS/Linux though because
`AbsolutePath` already removes them (which is not the case on Windows).
Resolves #2174.
(cherry picked from commit 4e870214bf)